JEE Main Physics question

When two blocks and , coupled by a spring on a frictionless table, are stretched and then released, then

(A)Kinetic energy of body at any instant after releasing is inversely proportional to their masses
(B)Kinetic energy of body at any instant may or may not be inversely proportional to their masses
(C) when spring is masslessCorrect
(D)Both (B) and (C) are correct

Answer: (C)

Solution

By momentum conservation (zero net momentum, since initially at rest), at every instant, so

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Question ID VK-158625