Posted by Marissa on Thursday, January 17, 2013 at 10:42pm.
At the moment car A is starting from rest and accelerating at 5.0 m/s2, car B passes it moving at a constant speed of 45m/s. How long will it take car A to catch up with car B?

physics  drwls, Thursday, January 17, 2013 at 11:29pm
A will pass B when the distances travelled by each are the same, at the same time t.
(a/2) t^2 = V*t
t = 0 or 2 V/a = 18 seconds

physics  Devron, Thursday, January 17, 2013 at 11:39pm
Since know one has answered this question, I will give it a try. But hopefully someone checks my work because I am a little tired. For Car A, Vi=0, a=5m/s^2, and t=?. For Car B, Vi=45m/s, Vf=45m/s, a=0, and t=?. Using two of the kinematic equations, 1/2(Vi+Vf)t=d and d=Vi(t)+1/2at^2 plug in the values and set the equations equal to each other and solve for t. 1/2(Vi+Vf)t=Vi(t)+1/2at^2. Hopefully you get 18s if I did it correctly. For the equation on the left substitute the values for Car B into it and the equation on the right substitute the values for Car A into it.

physics  drwls, Friday, January 18, 2013 at 1:21am
I know one who answered it.
Answer This Question
Related Questions
 physics  Cars A and B are racing each other along the same straight road in the...
 physics  Cars A and B are racing each other along a straight path in following ...
 physics  Cars A and B are racing each other along a straight path in following ...
 physics  A car travelling 19.4m/s passes apolice car at rest.As it passes, the ...
 physics  Cars A and B are racing each other along the same straight road in the...
 physics  Car a starts from rest and speeds up with constant accelleration until...
 Physics  Consider two toy cars. Car A starts from rest and speeds up with ...
 Physics  Consider two toy cars. Car A starts from rest and speeds up with ...
 Physics  Consider two toy cars. Car A starts from rest and speeds up with ...
 math  Consider two toy cars. Car A starts from rest and speeds up with constant...
More Related Questions