An object resting on a horizontal surface is moved 2.5 m along the plane under the action of a horizontal force of 20 N. Calculate the work done by the force. A hoist raises 15 crates, each of mass...

An object resting on a horizontal surface is moved 2.5 m along the plane under the action of a horizontal force of 20 N. Calculate the work done by the force.

A hoist raises 15 crates, each of mass 250 kg, a vertical distance of 3.0 m. Determine the work done by the hoist.