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Questions  

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

a
510 N
b
480 N
c
490 N
d
500 N

detailed solution

Correct option is D

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

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