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Block A of mass m is placed on a plank B...

Block `A` of mass `m` is placed on a plank `B`. A light support `S` is fixed on plank `B` and is attached with the block A with a spring of spring constant `K`. Consider that initially spring is in its natural length. If the plank `B` is given an acceleration a, then maximum compression in the spring is `(xma)/(k)`. Find the value of `x` (All the surface are smooth)

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