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A man of mass 60 kg is standing on a weighing machine kept in a box of mass 30 kg as shown in the diagram. If the man manages to keep the box stationary the reading in the weighing machine is

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300N

400N

600N

150N

answer is A.

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Detailed Solution

The tension on the external box and the tension acting on the man will be balancing the weight of man+box

$2 T = 60 g + 30 g \Rightarrow T = 450 N$

Forces acting on the man are given by,

$N + T = M g \Rightarrow N + 450 = 600 \Rightarrow N = 150 N$

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