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