Question

A boy of mass m clims up a staircase of height h
Work done by the boy
Work done if he uses elevator

Answer 1

Answer:

hy dude ur answer is

Explanation:

Here while boy is in the lift we will have a force of m×g.

As the force and displacement are in opposite direction there will be an angle of 180 degree between them.

We know that W=F×Scosθ.On substituting we get F=m×g×hcos180

o

=−m×g×h.

Hence lift does a work of m×g×h against to gravity.

Hope it helps u

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