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Question

A man of mass 60 kg is standing on a horizontal conveyer belt (fig). When the belt is given an acceleration of 1ms−2, the man remains stationary with respect to the moving belt. If g=10ms−2, the net force acting on the man is :

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A
-0.6 N
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B
6 N
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C
60 N
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D
600 N
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Solution

The correct option is C 60 N
Mass of man =60 kg
The conveyer belt is moving with an acceleration of 1m/s2.
As man is stationary with respect to moving belt, so the acceleration of man will be the same as that of moving belt.
So, acceleration of man, a =1m/s2
Hence, the net force on man =ma
=60×1=60N

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