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