1. A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? 250 J

215 J

35 J

15 J

45 J

2. If the net work done on a particle is zero, which of the following statements must be true? The velocity is decreased

The velocity is unchanged

The speed is unchanged

The velocity is zero