## Find the Total Work Done on an Object

Two boys pull a block along the floor for a distance of 4.0 m toward the east. One boy
pulls with a force F_{1} ( magnitude 75 N )

and the other pulls with F_{2} ( also magnitude 75 N).
A friction force f_{r} ( magnitude 25 N ) opposes the motion. Find the following:

a) How much work is done on the block by each force?

b) What is the total work done on the block by all three forces?

c) If the block has a mass of 20 kg and has an intial velocity of $5\frac{m}{s}$.

What is the velocity of the block at the end of the 4.0 m?