How much work is done?

Question

In the figure, the rock weighs 225 lb and is lifted 1 ft by the lever.

How much work is done?

The other end of the lever is pushed down 3 ft while lifting the rock. What force had to act on that end?

Answer 1

Work = Force times distance, times cosine of the angle if the force is applied at an angle different from the movement

W=FD = 225 x 1 = 225 joules