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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)

A

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

B

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

C

`(m)/(2)gat^(2)`

D

0

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The correct Answer is:
A
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