$A$ string is used to pull a block of mass $m$ vertically up by a distance $h$ at a constant acceleration $\frac{g}{3}$. The work done by the tension in the string is ..............
- A$\frac{2}{3} m g h$
- B$\frac{-m g h}{3}$
- C$m g h$
- D$\frac{4}{3} m g h$
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