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Q.

10 bullets each of mass 10 gm are fired in succession into a block of mass 450gm at rest. If velocity of each bullet is 110 ms‑1 and all the bullets are embedded in the block, the velocity of the block is

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a

 5 ms‑1  

b

10 ms‑1

c

 15 ms‑1

d

20 ms‑1

answer is D.

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Detailed Solution

Applying law of conservation of momentum

mnv=M+nmV

V=mnvM+mn

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10 bullets each of mass 10 gm are fired in succession into a block of mass 450gm at rest. If velocity of each bullet is 110 ms‑1 and all the bullets are embedded in the block, the velocity of the block is