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Friction General Understanding

A block of ma...

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A block 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 friction.(why CAN'T WE SOLVE IT LIKE Mu=2mv where v is common velocity of BLOCK B And C)

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