Final answer:
The boy does 90 Joules of work on the box by lifting it with a force of 60 N through a distance of 1.5 m.
Step-by-step explanation:
The boy does work on the box when lifting it, and the amount of work can be calculated using the formula Work = Force × Distance. Given that he exerts an average force of 60 Newtons (N) and lifts the box 1.5 meters (m), we can calculate this as:
Work = 60 N × 1.5 m = 90 Joules (J)
Work is the product of the component of the force acting in the direction of the displacement and the magnitude of the displacement. In this case, since we're assuming the force is upward and the displacement is also upward, the full magnitude of the force can be used in the calculation.