JEE Main Physics question

Two blocks of masses and are connected by a massless spring and placed on a smooth surface. The spring is initially stretched and released. Then,

(A)The momentum of each particle remains constant separately
(B)The magnitude of momentum of both bodies are the same as each other (at every instant)
(C)The mechanical energy of the system remains constant
(D)Both (B) and (C) are correctCorrect

Answer: (D)

Solution

With no external horizontal force, total momentum (initially zero) stays zero, so at every instant, i.e. equal magnitudes of momentum — (B) is true. The surface is

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Question ID VK-158631