Question

A girl pulls a wagon along a level path for a distance of 25.0 m. The handle of the wagon makes an angle of 20.0° with the horizontal, and the girl exerts a force of 45.0 N on the handle. Friction provides a force of 34.0 N. Find the net work that is done on the wagon.

Answer 1

The net work done on the wagon is 275.0 N·m.

Step-by-step explanation:

The net work done on the wagon can be calculated by finding the work done by the girl and subtracting the work done by friction. The work done by the girl is equal to the force she exerts multiplied by the distance she pulls the wagon: W_girl = force_girl x distance = 45.0 N x 25.0 m = 1125.0 N·m. The work done by friction is equal to the force of friction multiplied by the distance: W_friction = force_friction x distance = 34.0 N x 25.0 m = 850.0 N·m. The net work done on the wagon is calculated by subtracting the work done by friction from the work done by the girl: Net work = W_girl - W_friction = 1125.0 N·m - 850.0 N·m = 275.0 N·m.