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A duster weighs 0.5N. It is pressed agai...

A duster weighs `0.5N`. It is pressed against a vertical board with a horizontal force `11N` If the co-efficient of friction is `0.5` the mimmum force that must be applied on the duster parallel to the board to move it upwards is .

A

`0.4N`

B

`0.7N`

C

`6N`

D

`7N`

Text Solution

Verified by Experts

The correct Answer is:
C
`F_(up) = f + mg, f = mu N,N =F`
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