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A block of mass 10 kg is kept on a fixe...

A block of mass 10 kg is kept on a fixed rough `(mu=0.8)` inclined plane of angle of inclination `30^(@)`. The frictional force acting on the block is

A

`2.3 ms^-2` down the plane

B

`5 mo^-2` down the plane

C

`2.3 mo^-2` up the plane

D

Zero

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