A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.0 m above the ground. What is the mass of the box?
A) 5.3 kg
B) 6.7 kg
C) 8.9 kg
D) 8.0 kg

Question

Quizplus · Accepted Answer

The work done (350 J) is equal to the gravitational potential energy gained by the box, which is mgh. Using the formula: 350 J = m * 9.8 m/s² * 4.0 m, solving for m gives m = 8.9 kg.

A Child Does 350 J of Work While Pulling a Box