A disc of mass 3m and a disc of mass m are connected by mas…

Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

A disc of mass 3m and a disc of mass m are connected by massless spring of stiffness k. The heavier disc is placed on the ground with the spring vertical and lighter disc on top. From its equilibrium position the upper disc is pushed down by a distance δ and released. Then-

if δ > 3 mg/k, the lower disc will bounce up

if δ = 2mg/k, maximum normal reaction from ground on lower disc = 6 mg

if δ = 2mg/k, maximum normal reaction from ground on lower disc = 4mg

if δ > 4 mg/k, the lower disc will bounce up

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(b, d)

To bounce up the lower block initial compression to be given after equilibrium.

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