Posted by kago on .
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?

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