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Blocks A (mass 5.00 kg) and B (mass 7.00 kg) move on a frictionless, horizontal surface....

Blocks A (mass 5.00 kg) and B (mass 7.00 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 all motion before and after the collision is along a straight line. Let +x be the direction of the initial motion of block A. Find the maximum energy stored in the spring bumpers. Find the velocity of block A after they have moved apart. Find the velocity of B after they have moved apart. I appreciate the willingness to help me, I've (and I'm not kidding) been doing physics for 17.5 hours without moving, completely straight. I need help with this.

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