Physics
posted by kago .
A 0.490 kg hockey puck, moving east with a speed of 5.80 m/s, has a headon collision with a 0.870 kg puck initially at rest. Assume a perfectly elastic collision. (Let east be the +x direction.)
(a) What will be the speed of each object after the collision?
0.490 kg puck
0.870 kg puck
(b) What will be the direction of each puck after the collision?

A derivation of the equation for this situation can be found at
http://www.realworldphysicsproblems.com/elasticcollision.html