Q 1487712687.     A block of mass `m` tied to a string is lowered by a distance d, at a constant acceleration of `g/3`. The work done by the string is

A

`(mgd)/3`

B

`(-mgd)/3`

C

`2/3mgd`

D

`(-2)/3mgd`

HINT

`mg - T = ma = (mg)/3`
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