A block of mass m is suspended by a ligh...

A block of mass m is suspended by a light thread from an elevator. The elevator is accelerating upward with uniform acceleration a. The work done by tension on the block during t seconds is (u = 0)

`m/2 (g-a)at^(2)`

`m/2(g+a)at^(2)`

`m(g-a)at^(2)`

`m(g+a)at^(2)`

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