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A mass M is lowered with the help of a s...

A mass M is lowered with the help of a string by a distance h at a distance acceleration `g//2`. The work done by the string will be

A

`(Mgh)/(2)`

B

`-(Mgh)/(2)`

C

`(3Mgh)/(2)`

D

`-(Mgh)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Tension in the string :
`T = M(g - a) = M (g - g//2) = Mg//2`
`W = Force xx Displacement = - M (g//2) h`
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