Given below are a few situations, study them and state in which of the given cases work is said to be done. Give reason for your answer:

Q. Given below are a few situations, study them and state in which of the given cases work is said to be done. Give reason for your answer:
(i) A person pushing hard a huge rock but the rock does not move.
(ii) A bullock pulling a cart upto 1 km on road.
(iii) A girl pulling a trolley for about 2 m distance.
(iv) A person standing with a heavy bag on his head.
Ans. (i) No work, as displacement is zero.
(ii) Yes, as force is applied and there is displacement.
(iii) Yes, as force is applied and there is displacement.
(iv) No work, as there is no displacement.

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