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JEE Advanced 2016 Paper 2

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Question : 14

Total: 54

A block with mass M is connected by a massless spring with stiffness constant k to a rigid wall and moves without friction on a horizontal surface. The block oscillates with small amplitude A about an equilibrium position x0.Consider two cases : (i) when the block is at x0 ; and (ii) when the block is at x=x0+A. In both the cases, a particle with mass m( < M) is softly placed on the block after which they stick to each other. Which of the following statement(s) is(are) true about the motion after the mass m is placed on the mass M?

[JEE Adv 2016 P2]

The amplitude of oscillation in the first case changes by a factor of √
M
m+M
, whereas in thesecond case it remains unchanged
The final time period of oscillation in both the cases is same
The total energy decreases in both the cases
The instantaneous speed at x0 of the combined masses decreases in both the cases.

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