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Q.

A block A of mass M moving with speed u collides elastically with block B of mass m which is connected to block C of mass m with a spring.When the compression in spring is maximum, the velocity of block C with respect to block A is(Neglect the friction everywhere)

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a

zero

b

MM+mu

c

mM+mu

d

mMu

answer is C.

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Detailed Solution

Here, vA=M-mM+mu and vB=2MuM+mVelocity of C at maximum compression, vc = vB/2∴       vC=122MM+mu=MM+mu∴       vCA=vC-vA=mM+mu
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