Ramu is working hard to push a huge rock by applying 1 N force, but the rock does not move at all. The net work done by Ramu is:

How is work defined in physics?

It is easier to roll a stone uphill on a sloped road than to lift it vertically upward because:

The gravitational potential energy of an object at a height is the work done to lift it from the ground to that height _____________.