What is the work done by gravitational force in taking a mass m to a height h with uniform motion?

What is the work done by centripetal force?/

What is uniform motion ?

What is gravitational force?

Explain work done by a variable force.

when is the work done by a force negative.

A rain drop of radius 2 mm falls from a height of 500 nr above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height, it attains its maximum (terminal) speed, and moves with uniform speed thereafter. What is the work done by the gravitational force on the drop in the first and second half of its journey ? What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 10 m s^-1 ?

What is the direction of gravitational force betwen two particles?