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

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)/(3)mgd`
D. `(-2)/(3)mgd`

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

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