Blocks A (mass 3.50 kg ) and B (mass 6.00 kg) move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 4.00 m/s. The blocks are equipped with ideal spring bumpers. The collision is head-on, so ll motion before and after the collision is along a straight line. Let +z be the direction of the initial motion of block A.

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