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A 60 kg block is pushed up on inclined p...

A 60 kg block is pushed up on inclined plane by means of a horizontal push P as shwon in the figure . The coefficients of friction between the incline and block are `mu_(s) = 0.6` and `mu_(k) = 0.4` and the ramp makes an angle of `30^(@)` with the horizontal .
(a) What value of P is required to move the block at a constant speed of `0.20` m/s along the incline ?
(b) If the person should stop for rest and let P = 0 , does the block slide back on the incline ?

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