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A disc of mass 3m and a disc of mass m are connected by a 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  and released. Then (A) if  > 3mg/k, the lower disc will bounce up (B ) if  = 2mg/k, maximum normal reaction from ground on lower disc = 6 mg. (C) if  = 2mg/k, maximum normal reaction from ground on lower disc = 4 mg. (D ) if  > 4mg/k, the lower disc will bounce up

A disc of mass 3m and a disc of mass m are connected by a 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
and released. Then
(A) if
> 3mg/k, the lower disc will bounce up
(B
)
if
= 2mg/k, maximum normal reaction from ground on lower disc = 6 mg.
(C) if
= 2mg/k, maximum normal reaction from ground on lower disc = 4 mg.
(D
)
if
> 4mg/k, the lower disc will bounce up

Grade:11

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