Question

An escalator is moving downward with a uniform speed of u. A man of mass m is running upward on it at a uniform speed of v. If the height of the escalator is h, the work done by the man in going up the escalator is?

Answer 1

W=FD where W is work, F is force, and D is displacement. Find F and you will be able to get work.

Answer 2

mgh