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Q.

The length of a ballistic pendulum is 1 m and mass of its block is 0.98 kg. A bullet of mass 20 gram strikes the block along horizontal direction and gets embedded in the block. If block + bullet completes vertical circle of radius 1m, then the
striking velocity of bullet is........... m / s

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Detailed Solution

To complete the vertical circle the velocity of combined bullet+block must be 5gr

mv=m+M5gr

v=M+mm5gr=0.98+0.020.025×9.8×1=350

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