# Finding constant velocity,final velocity and acceleration of these cars?

 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
HW Helper
P: 2,318
 Quote by xod_s 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
Did you by any chance mean 21 s [seconds] rather than 215 and no units.
 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.
HW Helper
P: 2,318
Finding constant velocity,final velocity and acceleration of these cars?

 Quote by xod_s @ 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.
I hope you really meant 24.6 for the constant velocity.

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.

 Related Discussions Introductory Physics Homework 1 Introductory Physics Homework 6 Introductory Physics Homework 5 Introductory Physics Homework 1 Introductory Physics Homework 1