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Q.

A bullet weighing 50 g leaves the muzzle of the  gun with a velocity of 30 m/s. If the recoil speed imparted to the gun is 1 m/s, the mass of the gun:

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a

20 kg

b

1.45 kg

c

15 kg

d

30 kg

answer is C.

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Detailed Solution

Velocity of the bullet relative to the ground =( 30-1) m/s = 29 m/s

Conserving momentum , m×1 = 501000×29 ⇒M = 1.45 kg

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