Question

A man reached the top of a building by using the lift,and came back by the stairs.In which situation has he done more work?Justify your answer.

Answer 1

By following the stairs because muscular energy is used more in stairs

Answer 2

if we think of total work done not only by men then the work done is same in both the cases because when he is going upwards the lift has done some work. and when he is going downwards by stairs friction and muscular forces has done work which makes work done equal in both the cases but if we think only about men then he has done more work while going downwards by stairs.

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