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A small body of mass m is given velocity...

A small body of mass `m` is given velocity `v_0` at point `O` on rough horizontal surface. (a) Find the mean power developed by the friction force during the whole time of motion if the friction coefficient is constant and equal to `mu_0` (b) Find the maximum instantaneous power developed by the friction force, if the friction coefficient varies as `mu=mu_0x`, where `mu_0` is a constant and `x` is the distance from the point `O`.

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