Question

Ball A, moving with an initial speed of 3 m/s, has a head-on collision with another ball B at rest, which is twice as massive as A . What are the final velocities of A and B if the collision is elastic?



a)-1 m/s, 2 m/s

b)2 m/s, -2 m/s

c)-2 m/s, 2 m/s

d)-2 m/s, 1 m/s

Answer 1

Hey, let me help, will you?!

Answer 2

@Hoslos thank you! I already tried it and I got a)! But thanks anyways :)

Answer 3

Yes, so let me just stamp my presence. In elastic collision, the relative speed ( difference in soeed) before and after collision shall be equal. Before collision, 3-0=3, after collision -1-2=-3, therefore is a. The sign of magnitude does not matter. See you.

Answer 4

Thanks!! @Hoslos

Answer 5

No problem.