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A gun fires a bullet of mass 50 g with a...

A gun fires a bullet of mass `50 g` with a velociy of `30 m//s`. Due to this, the gun is pushed back with a velocity of `1 m//s`, then the mass of the gun is :

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SL ARORA-Laws of Motion-Exercise
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  14. A machine gun fires a bullet of mass 40 g with a velocity 1200 ms^-1. ...

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