Question

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 above the ground. What is the mass of the box

Answer 1

Answer:

8.929kg

Explanation:

The work done to place the box at tree house=350 J.

The distance from ground to tree house =4.0 m and $g=9.8m/s^2$

$E=mgh\\\\m=350J/(9.8m/s^2\times 4.0m)\\\\m=8.929kg$

Hence the mass of the box is 8.929kg