Q 1310878710.     An `8.0` `kg` box is released on a `30^∘` inclined and accelerates down the incline at `30m//s^2` Find the frictional force impending its motion . How large is the coefficient of friction in this situation ?

A

`62`

B

`24`

C

`0.54`

D

`2.76`

HINT

`mu=f/W`

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