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A block of mass m is kept on a platform ...

A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in fig. Work done by normal reaction on block in time t is :

A

`-(mg^(2)t^(2))/(8)`

B

`(mg^(2)t^(2))/(8)`

C

0

D

`(3mg^(2)t^(2))/(8)`

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    A
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