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A 6kg block is kept on an inclined rough...

A `6kg` block is kept on an inclined rought surface as shown in figure. Find the force `F` required to
(a) keep the block stationary,
(b) move the block downwards with constant velocity and
(c ) move the block upwards with on acceleration of `4m//s^(2)`. `(Take =10m//g^(2))`

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