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A box of mass 25 kg starts from rest and...

A box of mass `25 kg` starts from rest and slide down as inclined plane `8` metre long and `5` meter length . It is found to move at the bottom at `7 m//s`. What is the force of friction?

A

`79.6 N`

B

`96.6 N`

C

`76.6 N`

D

`116.6 N`

Text Solution

Verified by Experts

Suppose `V` be velocity at the end of inclined plane
Then, `Fs = mgh - (1)/(2) mV^(2)`
or `F xx 8 = 25 xx 9.8 xx 5 - (1)/(2) xx 25 xx 7^(2)`
Solving we get `F = 76.6 N`
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