What is the minimum distance from the car light in which he can bring his car to a stop?












0












$begingroup$


A motorist is traveling at a constant speed V0 and is approaching a traffic light. He wishes to stop the car at the light. However, his reaction time, that is, the time it takes him to put his foot on the brakes, is T and the maximum deceleration of the braked car is a. What is the minimum distance from the car light in which he can bring his car to a stop?
The answer is supposed to be (V0²/2a) + V0T but I don't know how to get there. What I did until now was that:



a = -a



v = -at + C



V0 = -aT + C



V0 + aT = C



v = -at + V0 + aT



s = (-a/2)t² + V0t + aTt + C



0 = (-a/2)0² + V0.0 + At.0 + C



0 = C



s = (-a/2)t² + V0t + aTt



v = -at + V0 + aT



0 = -at + V0 + aT



V0 + aT = at



(V0 + aT)/a = t



Then substituting time in the "s = (-a/2)t² + V0t + aTt" equation gives us



(V0² + a²T² + 2aT)/2a



Did I do something wrong?










share|cite|improve this question











$endgroup$












  • $begingroup$
    $s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:16












  • $begingroup$
    Fixed, it was 0 so it doesn't change a thing and thank you btw.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 17:19












  • $begingroup$
    Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:24










  • $begingroup$
    what does $t=0$ represents for you ?
    $endgroup$
    – G Cab
    Dec 17 '18 at 17:25










  • $begingroup$
    Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:20


















0












$begingroup$


A motorist is traveling at a constant speed V0 and is approaching a traffic light. He wishes to stop the car at the light. However, his reaction time, that is, the time it takes him to put his foot on the brakes, is T and the maximum deceleration of the braked car is a. What is the minimum distance from the car light in which he can bring his car to a stop?
The answer is supposed to be (V0²/2a) + V0T but I don't know how to get there. What I did until now was that:



a = -a



v = -at + C



V0 = -aT + C



V0 + aT = C



v = -at + V0 + aT



s = (-a/2)t² + V0t + aTt + C



0 = (-a/2)0² + V0.0 + At.0 + C



0 = C



s = (-a/2)t² + V0t + aTt



v = -at + V0 + aT



0 = -at + V0 + aT



V0 + aT = at



(V0 + aT)/a = t



Then substituting time in the "s = (-a/2)t² + V0t + aTt" equation gives us



(V0² + a²T² + 2aT)/2a



Did I do something wrong?










share|cite|improve this question











$endgroup$












  • $begingroup$
    $s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:16












  • $begingroup$
    Fixed, it was 0 so it doesn't change a thing and thank you btw.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 17:19












  • $begingroup$
    Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:24










  • $begingroup$
    what does $t=0$ represents for you ?
    $endgroup$
    – G Cab
    Dec 17 '18 at 17:25










  • $begingroup$
    Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:20
















0












0








0





$begingroup$


A motorist is traveling at a constant speed V0 and is approaching a traffic light. He wishes to stop the car at the light. However, his reaction time, that is, the time it takes him to put his foot on the brakes, is T and the maximum deceleration of the braked car is a. What is the minimum distance from the car light in which he can bring his car to a stop?
The answer is supposed to be (V0²/2a) + V0T but I don't know how to get there. What I did until now was that:



a = -a



v = -at + C



V0 = -aT + C



V0 + aT = C



v = -at + V0 + aT



s = (-a/2)t² + V0t + aTt + C



0 = (-a/2)0² + V0.0 + At.0 + C



0 = C



s = (-a/2)t² + V0t + aTt



v = -at + V0 + aT



0 = -at + V0 + aT



V0 + aT = at



(V0 + aT)/a = t



Then substituting time in the "s = (-a/2)t² + V0t + aTt" equation gives us



(V0² + a²T² + 2aT)/2a



Did I do something wrong?










share|cite|improve this question











$endgroup$




A motorist is traveling at a constant speed V0 and is approaching a traffic light. He wishes to stop the car at the light. However, his reaction time, that is, the time it takes him to put his foot on the brakes, is T and the maximum deceleration of the braked car is a. What is the minimum distance from the car light in which he can bring his car to a stop?
The answer is supposed to be (V0²/2a) + V0T but I don't know how to get there. What I did until now was that:



a = -a



v = -at + C



V0 = -aT + C



V0 + aT = C



v = -at + V0 + aT



s = (-a/2)t² + V0t + aTt + C



0 = (-a/2)0² + V0.0 + At.0 + C



0 = C



s = (-a/2)t² + V0t + aTt



v = -at + V0 + aT



0 = -at + V0 + aT



V0 + aT = at



(V0 + aT)/a = t



Then substituting time in the "s = (-a/2)t² + V0t + aTt" equation gives us



(V0² + a²T² + 2aT)/2a



Did I do something wrong?







calculus






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share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Dec 17 '18 at 17:20







Irlydontknow

















asked Dec 17 '18 at 16:58









IrlydontknowIrlydontknow

82




82












  • $begingroup$
    $s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:16












  • $begingroup$
    Fixed, it was 0 so it doesn't change a thing and thank you btw.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 17:19












  • $begingroup$
    Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:24










  • $begingroup$
    what does $t=0$ represents for you ?
    $endgroup$
    – G Cab
    Dec 17 '18 at 17:25










  • $begingroup$
    Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:20




















  • $begingroup$
    $s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:16












  • $begingroup$
    Fixed, it was 0 so it doesn't change a thing and thank you btw.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 17:19












  • $begingroup$
    Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
    $endgroup$
    – eyeballfrog
    Dec 17 '18 at 17:24










  • $begingroup$
    what does $t=0$ represents for you ?
    $endgroup$
    – G Cab
    Dec 17 '18 at 17:25










  • $begingroup$
    Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:20


















$begingroup$
$s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
$endgroup$
– eyeballfrog
Dec 17 '18 at 17:16






$begingroup$
$s = (-a/2)t² + V_0t + aTt$ Where's your constant of integration?
$endgroup$
– eyeballfrog
Dec 17 '18 at 17:16














$begingroup$
Fixed, it was 0 so it doesn't change a thing and thank you btw.
$endgroup$
– Irlydontknow
Dec 17 '18 at 17:19






$begingroup$
Fixed, it was 0 so it doesn't change a thing and thank you btw.
$endgroup$
– Irlydontknow
Dec 17 '18 at 17:19














$begingroup$
Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
$endgroup$
– eyeballfrog
Dec 17 '18 at 17:24




$begingroup$
Hint: that's not true. What time interval are you integrating over? Is the car's displacement 0 at the start of that interval?
$endgroup$
– eyeballfrog
Dec 17 '18 at 17:24












$begingroup$
what does $t=0$ represents for you ?
$endgroup$
– G Cab
Dec 17 '18 at 17:25




$begingroup$
what does $t=0$ represents for you ?
$endgroup$
– G Cab
Dec 17 '18 at 17:25












$begingroup$
Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:20






$begingroup$
Well, I believe that t represents the time and yes the car displacement at the start of the interval 0 is 0. It has an initial velocity of V0 but at the interval 0 it hasn't moved yet.
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:20












2 Answers
2






active

oldest

votes


















0












$begingroup$

Following your scheme and indicating with$T$ the reaction time
and with $Delta t$ the following time interval to stop
$$
eqalign{
& a = - a cr
& v(t) = - at + C cr
& v(0) = V_0 = C cr
& v(t) = V_0 - at cr
& v(Delta t) = 0 = V_0 - aDelta t cr
& Delta t = V_0 /a cr
& s = V_0 T + overline {v(t)} ;Delta t = V_0 T + {{left( {v(0) + v(Delta t)} right)} over 2};Delta t = cr
& = V_0 T + {{left( {V_0 + 0} right)} over 2};{{V_0 } over a} = V_0 T + {1 over 2};{{V_0 ^{,2} } over a} cr}
$$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:39










  • $begingroup$
    until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
    $endgroup$
    – G Cab
    Dec 17 '18 at 23:10










  • $begingroup$
    Ooh, now everything makes sense. Thank you!
    $endgroup$
    – Irlydontknow
    Dec 18 '18 at 13:56



















0












$begingroup$

$$v^2-u^2=2astag{Third equation of motion}$$
Put $v=0$(final velocity), $u=v_0$(initial velocity) and $a=-a$(deceleration) for this case to get$$v_0^2=2as$$
where $s$ is the distance further travelled.






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:41













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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









0












$begingroup$

Following your scheme and indicating with$T$ the reaction time
and with $Delta t$ the following time interval to stop
$$
eqalign{
& a = - a cr
& v(t) = - at + C cr
& v(0) = V_0 = C cr
& v(t) = V_0 - at cr
& v(Delta t) = 0 = V_0 - aDelta t cr
& Delta t = V_0 /a cr
& s = V_0 T + overline {v(t)} ;Delta t = V_0 T + {{left( {v(0) + v(Delta t)} right)} over 2};Delta t = cr
& = V_0 T + {{left( {V_0 + 0} right)} over 2};{{V_0 } over a} = V_0 T + {1 over 2};{{V_0 ^{,2} } over a} cr}
$$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:39










  • $begingroup$
    until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
    $endgroup$
    – G Cab
    Dec 17 '18 at 23:10










  • $begingroup$
    Ooh, now everything makes sense. Thank you!
    $endgroup$
    – Irlydontknow
    Dec 18 '18 at 13:56
















0












$begingroup$

Following your scheme and indicating with$T$ the reaction time
and with $Delta t$ the following time interval to stop
$$
eqalign{
& a = - a cr
& v(t) = - at + C cr
& v(0) = V_0 = C cr
& v(t) = V_0 - at cr
& v(Delta t) = 0 = V_0 - aDelta t cr
& Delta t = V_0 /a cr
& s = V_0 T + overline {v(t)} ;Delta t = V_0 T + {{left( {v(0) + v(Delta t)} right)} over 2};Delta t = cr
& = V_0 T + {{left( {V_0 + 0} right)} over 2};{{V_0 } over a} = V_0 T + {1 over 2};{{V_0 ^{,2} } over a} cr}
$$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:39










  • $begingroup$
    until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
    $endgroup$
    – G Cab
    Dec 17 '18 at 23:10










  • $begingroup$
    Ooh, now everything makes sense. Thank you!
    $endgroup$
    – Irlydontknow
    Dec 18 '18 at 13:56














0












0








0





$begingroup$

Following your scheme and indicating with$T$ the reaction time
and with $Delta t$ the following time interval to stop
$$
eqalign{
& a = - a cr
& v(t) = - at + C cr
& v(0) = V_0 = C cr
& v(t) = V_0 - at cr
& v(Delta t) = 0 = V_0 - aDelta t cr
& Delta t = V_0 /a cr
& s = V_0 T + overline {v(t)} ;Delta t = V_0 T + {{left( {v(0) + v(Delta t)} right)} over 2};Delta t = cr
& = V_0 T + {{left( {V_0 + 0} right)} over 2};{{V_0 } over a} = V_0 T + {1 over 2};{{V_0 ^{,2} } over a} cr}
$$






share|cite|improve this answer









$endgroup$



Following your scheme and indicating with$T$ the reaction time
and with $Delta t$ the following time interval to stop
$$
eqalign{
& a = - a cr
& v(t) = - at + C cr
& v(0) = V_0 = C cr
& v(t) = V_0 - at cr
& v(Delta t) = 0 = V_0 - aDelta t cr
& Delta t = V_0 /a cr
& s = V_0 T + overline {v(t)} ;Delta t = V_0 T + {{left( {v(0) + v(Delta t)} right)} over 2};Delta t = cr
& = V_0 T + {{left( {V_0 + 0} right)} over 2};{{V_0 } over a} = V_0 T + {1 over 2};{{V_0 ^{,2} } over a} cr}
$$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered Dec 17 '18 at 17:25









G CabG Cab

19.4k31238




19.4k31238












  • $begingroup$
    Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:39










  • $begingroup$
    until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
    $endgroup$
    – G Cab
    Dec 17 '18 at 23:10










  • $begingroup$
    Ooh, now everything makes sense. Thank you!
    $endgroup$
    – Irlydontknow
    Dec 18 '18 at 13:56


















  • $begingroup$
    Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:39










  • $begingroup$
    until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
    $endgroup$
    – G Cab
    Dec 17 '18 at 23:10










  • $begingroup$
    Ooh, now everything makes sense. Thank you!
    $endgroup$
    – Irlydontknow
    Dec 18 '18 at 13:56
















$begingroup$
Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:39




$begingroup$
Thank you, I was able to see my mistake but I didn't understand a few things. Why did you sum V0T to the displacement function? Where did that V0T actually come from?
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:39












$begingroup$
until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
$endgroup$
– G Cab
Dec 17 '18 at 23:10




$begingroup$
until the driver actually press the brake, the car will continue with the constant initial speed (for a time T $to s_1=V_0T$). After that the deceleration will decrease (approx. linearly) the speed from $V_0$ to $0$ taking in $Delta t = V_0/a$. During this time the travelled distance $s_2$ will be equal to the average speed $V_0/2$ times $Delta t$.
$endgroup$
– G Cab
Dec 17 '18 at 23:10












$begingroup$
Ooh, now everything makes sense. Thank you!
$endgroup$
– Irlydontknow
Dec 18 '18 at 13:56




$begingroup$
Ooh, now everything makes sense. Thank you!
$endgroup$
– Irlydontknow
Dec 18 '18 at 13:56











0












$begingroup$

$$v^2-u^2=2astag{Third equation of motion}$$
Put $v=0$(final velocity), $u=v_0$(initial velocity) and $a=-a$(deceleration) for this case to get$$v_0^2=2as$$
where $s$ is the distance further travelled.






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:41


















0












$begingroup$

$$v^2-u^2=2astag{Third equation of motion}$$
Put $v=0$(final velocity), $u=v_0$(initial velocity) and $a=-a$(deceleration) for this case to get$$v_0^2=2as$$
where $s$ is the distance further travelled.






share|cite|improve this answer









$endgroup$













  • $begingroup$
    Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:41
















0












0








0





$begingroup$

$$v^2-u^2=2astag{Third equation of motion}$$
Put $v=0$(final velocity), $u=v_0$(initial velocity) and $a=-a$(deceleration) for this case to get$$v_0^2=2as$$
where $s$ is the distance further travelled.






share|cite|improve this answer









$endgroup$



$$v^2-u^2=2astag{Third equation of motion}$$
Put $v=0$(final velocity), $u=v_0$(initial velocity) and $a=-a$(deceleration) for this case to get$$v_0^2=2as$$
where $s$ is the distance further travelled.







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered Dec 17 '18 at 17:22









Sameer BahetiSameer Baheti

5168




5168












  • $begingroup$
    Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:41




















  • $begingroup$
    Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
    $endgroup$
    – Irlydontknow
    Dec 17 '18 at 19:41


















$begingroup$
Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:41






$begingroup$
Thank you, that's it. But I wanted to solve it with the antidifferentiation method.
$endgroup$
– Irlydontknow
Dec 17 '18 at 19:41




















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