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A bullet of mass 0.01 kg and travelling ...

A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of mass 2 kg which is suspended by a string of length 5m. The center of gravity of the block is found to rise a vertical distance of 0.1m, figure. What is the speed of the bullet after it emerges from the block ? `(g=9.8 m//s^2)`.

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