Question

State and explain the work done in the
following situations:
i) A person carrying a heavy load walks
on a level road.
ii) A man spending his energy by
pushing on a concrete wall.

Answer 1

Note that forces without motion do no work. For example, if you push hard against a wall, you will eventually get very tired, but you will not do any work unless you actually move the wall in the direction you are pushing. ... In fact if a force is exerted in a direction perpendicular to the motion, no work at all is done.

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