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Finding constant velocity,final velocity and acceleration of these cars? 
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#1
Oct2611, 06:49 PM

P: 8

1. The problem statement, all variables and given/known data
Two cars go the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest and maintains a constant acceleration. Both cars cover a distance of 517 m in 215 and are moving in the + direction. Whats the constant velocity of car A as well as the final velocity and acceleration of car B? 2. Relevant equations 3. The attempt at a solution 


#2
Oct2711, 06:02 AM

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#3
Oct2711, 02:07 PM

P: 8

@ PeterO "Did you by any chance mean 21 s [seconds] rather than 215 and no units."
Yes I did.Thank you for pointing that out.It's supoose to be 21 seconds not vaugely 215.Also if it helps I know for sure that the constant velocity of Car A is 2.40 m/s. 


#4
Oct2711, 05:55 PM

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P: 2,316

Finding constant velocity,final velocity and acceleration of these cars?
One of the useful formulae for motion under constant acceleration is s = (u + v)/2 .t s = displacement, u = initial velocity, v = final velocity, t = time. for acceleration zero, u = v so the (u + v)/2 = (v + v)/2 = v The formula becomes s = vt, which you use to get that 24.6 when an object starts from rest, u = zero, so the formula becomes s = v/2 . t from that you can get the final velocity. as for acceleration .. the car reaches that velocity in 21 seconds, so you can divide by 21 to find the acceleration. 


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