Practice question
Question
A shell of mass 0.01kg is fired from a gun of mass 50kg with a muzzle speed of 100m/s. What is the recoil speed of the gun?
Explanation
By conservation of momentum, total momentum before and after firing is zero. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 0.02 m/s as the result, so option D is correct.
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