Posted by kelsey on Wednesday, October 15, 2008 at 12:54am.
They tell you the masses of both and their speeds before and after the collision. All you have to do is calculate and add up the kinetic energies (1/2) M V^2 of each mass, before and after.
They have already provided velocities that satisfy the momentum conservation requirement, so you don't have to apply conservation laws to do this problem.
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