MHT CET Physics question

A bullet is fired from the gun. It hits the solid block resting on a frictionless surface, gets embedded into it and both move jointly. In this process, [MHTCET 2023]

(A)Only kinetic energy is conserved
(B)Both momentum and kinetic energy are not conserved
(C)Both momentum and kinetic energy are conserved
(D)Only momentum is conservedCorrect

Answer: (D)

Solution

No external horizontal force acts, so momentum is conserved, but the collision is perfectly inelastic so

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Question ID VK-062519