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A heavy 3.8 kg block moves at 4.2 m/s and then makes a head-on elastic collision...

A heavy 3.8 kg block moves at 4.2 m/s and then makes a head-on elastic collision with a lighter, stationary block of mass 1.7 kg. Use conservation of momentum and the fact that the relative speed of recession equals the relative speed of approach to find velocity of each block after the collision. Check your answer by calculating the initial and final kinetic energies of each block.

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