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When is the work done in the following s...

When is the work done in the following situation:
(i) A boy pushing a wall
(ii) A girl carrying a school bag on her shoulders
(iii) A stone falling freely
(iv) A boy climbing up the stairs.

A

(i) and (ii)

B

(i) and (iii)

C

(ii) and (iv)

D

(iii) and (iv)

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