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A block of mass m rests on a rough horiz...

A block of mass m rests on a rough horizontal surface (Coefficient of friction is` µ`). When a bullet of mass `m//2` strikes horizontally, and get embedded in it, the block moves a distance d before coming to rest. The initial velocity of the bullet is `ksqrt(2mugd),` then the value of k is

A

2

B

3

C

4

D

5

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