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Q.

A bullet of mass 10 gm moving with a horizontal velocity 100m/s passes through a wooden block of mass 100 gm. The block is resting on a smooth horizontal floor. After passing through the block the velocity of the bullet is 10m/s. the velocity of the emerging bullet with respect to the block is

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a

10 m/s

b

9 m/s

c

1 m/s

d

5 m/s

answer is C.

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Detailed Solution

m1u1 =m1v1 +m2v2 , vrel = v1 - v2
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A bullet of mass 10 gm moving with a horizontal velocity 100m/s passes through a wooden block of mass 100 gm. The block is resting on a smooth horizontal floor. After passing through the block the velocity of the bullet is 10m/s. the velocity of the emerging bullet with respect to the block is