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There is a massless pulley which is goin...

There is a massless pulley which is going upward with an acceleration `a=5tm/s^(2)`.A string is passing over the pulley as shown in the figure. At one end of the string a plank of mass `2mkg` is attached and at the other end a small ball of mass `mkg` is attached. It is given that after 1sec it just passes the plank then if length of plank is x+0.8 .Find x

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