NEET 2013 Physics Conservation of Momentum MCQ Question
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m/s. The final velocity acquired by the person and the average force exerted on the person are:
−0.08 m/s; 16 N
−0.8 m/s; 8 N
−1.6 m/s; 16 N
−1.6 m/s; 8 N
Correct Answer
Detailed Explanation
Using conservation of momentum, the velocity of the person is calculated as v = (10 * 0.01 * 800) / 100 = 0.8 m/s. The force is F = Δp/Δt = 16 N.
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