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Momentum conservation when a bullet passes through and emerges from a block.

A bullet of mass M= .0052 kilogram moving horizontally at speed V=672 m/sec, stikes a stationary wood block of mass m= 0.700 kilogram on a level frictionless surface. The bullet emerges with its speed reduced to S= 428 m/sec. Find the speed of the wood block after the bullet emerges.

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The conservation of momentum requires that the intial momentum of the bullet before impact must ...