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A 5.20 g bullet moving at 700 m/s strike...

A 5.20 g bullet moving at 700 m/s strikes a 700 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 450 m/s. (a) What is the resulting speed of the block? (b) What is the speed of the bullet-block center of mass ?

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The correct Answer is:
(a)1.86 m/s ; (b) 5.16 m/s
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