A box is raised at constant speed by a man pulling up on a rope. During the
ascent, which of the following statements is true. Assume that air resistance is
negligible.
- The work done by all conservative forces on the box is 0.
- The work done by all non-conservative forces on the box is 0.
- The work done by all conservative forces on the box is positive.
- The work done by all non-conservative forces on the box is positive.