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Q.

A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newtons. The reading of the machine if the lift is moving upwards with uniform speed of 10 ms-1

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a

510 N

b

480 N

c

490 N

d

500 N

answer is D.

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Detailed Solution

When lift moves up or down with uniform speedThe apparent weight = real weightW = mg
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