Posted by Alex on Thursday, October 28, 2010 at 10:35pm.
A 550g ball traveling at 8.0 m/s undergoes a headon elastic collision with a 250g ball traveling toward it also at 8.0 m/s. What is the speed of the 250g mass after the collision?

physics  bobpursley, Thursday, October 28, 2010 at 10:42pm
You just have to use both momentum and energy equations, and do the messy algebra. Two equations, two unknowns (the two ball velocities after collision).
Enjoy the messy algebra.