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A block of mass 8 kg is kept on a rough ...

A block of mass `8 kg` is kept on a rough floor. The coefficients of friction are `mu_(s) = 0.5` and `mu_(k) = 0.4`. Force `F_(1) = 15 N` and `F_(2) = 20 N` are applied on the block as shown.
(a) Find the magnitude and the direction of friction force .
(b) If `F_(1) = 30 N , F_(2) = 40 N`, find the acceleration of the block.

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