mA 1.00 kg mg = 3.00 kg S
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Block A in Fig. has mass 1.00 kg, and block B has mass
3.00 kg. The blocks are forced together, compressing a spring S between
them; then the system is released from rest on a level, frictionless
surface. The spring, which has negligible mass, is not fastened to either
block and drops to the surface after it has expanded. Block B acquires
a speed of 1.20 m/s. (a) What is the final speed of block A? (b) How
much potential energy was stored in the compressed spring?
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