Question

why do we say that a lift delivers more power in taking a man up than that delivered by the man clinging stairs through the same height?

Answer 1

because im stairs forced along gravity is less... mean along height work done is less

Answer 2

Because if the man climbs stairs he goes in a slant way and when the lift delivers him the lift has to pull the man in a straight direction. So we say that a lift delivers more power in taking a man up.