# Elastic collisions and speed

1. Jun 21, 2014

### syavian1019

Ball A, a 0.055 kg ball, moving with a speed of 2.50 m/s collides head-on with ball B, a 0.095 kg ball initially moving away from it at a speed of 1.15 m/s. Assume a perfectly elastic collision. Take the initial velocity of ball A to be in the positive x direction.

(A) What is the speed of ball A after the collision?

(B) What is the speed of ball B after the collision

Can anyone walk me through this? I'm not sure where to start...

2. Jun 21, 2014

No effort, no help. Give us some of your thoughts on the problem at least.

Last edited: Jun 21, 2014