Work, Energy, and Power (4A) Practice Test

In a biomechanics test, a subject performs two lifts of the same box: Lift A raises it $0.50\ \text{m}$ vertically; Lift B raises it $0.25\ \text{m}$. Both start and end at rest, and losses are negligible. Principle tested: work against gravity. Which prediction is most consistent with the mechanical work done on the box by the subject?

A researcher pulls a sled carrying equipment across a lab floor. The applied force is constant, but the direction of motion reverses (the sled is pulled back along the same line). Principle tested: work sign and directionality. Which statement is most consistent with the work done by the same applied force magnitude during the return trip if the force is still directed forward (original direction)?