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

Question

${{m{g^2}{t^2}} \over 8}$

${{3m{g^2}{t^2}} \over 8}$

$-$ ${{m{g^2}{t^2}} \over 8}$

Solution

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