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Conservation of energy and momentum

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Blocks A and B are pressed together with a spring between them. When the blocks are released from rest, the spring pushes the blocks apart so the 0.35kg block A moves up the 30° ramp to the left and the 5.0kg block B moves to the right at vfB=0.25ms. Assume friction is negligible.
Which of the following is the best estimate of the maximum distance d that block A slides up the ramp?
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