posted by josh .
Blocks A A (mass 6.50kg kg ) and B B (mass 10.50kg kg ) move on a frictionless, horizontal surface. Initially, block B B is at rest and block A A is moving toward it at 4.00m/s m/s . The blocks are equipped with ideal spring bumpers. The collision is head-on, so all motion before and after the collision is along a straight line. Let +x +x be the direction of the initial motion of A A. Find the velocity of each block after they have moved apart.
Find the velocity of A A.