Coefficient of kinetic friction between ...

Coefficient of kinetic friction between 3 kg and 2 kg block is 0.25. The horizontal table surface is smooth. Find the acceleration (in S.I. unit) of the block of mass 10 kg.

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Block A has a mass of 2 kg and block B has a mass of 20 kg if the coefficient of kinetic friction between block B and the horizontal surface is 0.1, and B is accelerating towards the right with a = 2 m//s^(2) , then the mass of the block C will be -

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