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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
work done by escalator on the man is negative.
b
work done by gravity (due to earth) on escalator is negative only
c
work done by the man on the escalator is zero.
d
work done by gravity (due to earth) on the man is zero.
answer is B.
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