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A man is standing on a weighing machine ...

A man is standing on a weighing machine as shown, he manages to maintain his both hands horizontal. Reading on the weighing machine is Mg/2 and extension of both the springs is same after stretching. If `k_2 = 2k_1` then the reading of `k_1 and k_2` springs are `R_1 and R_2` respectively. (M: mass of the man) then `R_1= Mg//x` then 'x' is

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