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Q.

A block A of mass M rests on a wedge B of mass 2M and inclination θ. There is sufficient friction between A and B, so that A does not slip on B. If there is no friction between B and ground, the compression in spring is

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a

Mgcosθk

b

Mgcosθsinθk

c

Mgsinθk

d

zero

answer is D.

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Detailed Solution

On M, horizontal components of N and f  are balanced (as Mg is vertical). Hence, on 2M also, they will be balanced.∴ Horizontal force kx on 2M should be zero.
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