A boy is standing on a weighing machine in a lift and the reading of the scale is $600 N$ . The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the scale?

$600 N$

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$100 N$

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$0 N$

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can't be predicted

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Solution

The correct option is C
$0 N$

As we know that, during free fall the only force acting is a man's weight itself. So, both lift and the boy inside would be in a state of free fall and hence the normal contact force between the weighing machine and the man would be zero. Therefore the reading of the scale would be zero.

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A boy is standing on a weighing machine in a lift and the reading of the scale is 600 N. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the scale?

A boy is standing on a weighing machine in a lift and the reading of the scale is $600 N$ . The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the scale?