Question

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Q. A bullet of mass 15 g leaves the barrel of a gun with a velocity of 120 m/s. The gun recoils with a velocity of 1 m/s. The gun recoils with a velocity of 1 m/s. Find the mass of the gun. (Ans. 1.8 kg)

Answer 1

Dear student.

According to the conservation of momentum, m v = -M V
m = 15 g, v = 120 m/s and V = -1 m/s.
So M = - m v / V
Plugging, M = 15 g x 120 / 1 = 1800 g = 1.8 kg
Mass of gun = 1.8 kg

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