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Q.
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An Intiative by Sri Chaitanya
a
No work is done on moving a block uniformly on a smooth horizontal table.
b
work done by earth's gravitational force on moon is zero, considering moon's orbit to be circular
c
no work is done by weight lifter holding a 175 kg mass steadily on his shoulder for 30 s.
d
Work done by frictional force is always negative.
answer is D.
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