Q. 244.5( 6 Votes )

A porter with a suitcase on his head is climbing up steps with uniform speed. The work done by the “weight of the suitcase” on the suitcase is

(a) Positive

(b) Negative

(c) Zero

(d) Undefined

Answer :

(b)

Explanation : work done is negative because , gravitational force is the cause of weight and it acts downward on suitcase and displacement is upward.


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AP - Physics & Chemistry