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COM in Collision and Explosion

A machine gun...

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A machine gun fires 50 bullets per second and mass of each bullet is 100g. If 20m/s is the speed of each bullet and mass of gun is 10kg. Magnitude of acceleration of the gun is (1) 10m/s^2 (2) 1m/s^2 (3) 100m/s^2 (4) 0.1m/s^2

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