Final answer:
The force that the boy is pushing with is not equal to 100 N.
Step-by-step explanation:
The answer is b) False. The force that the boy is pushing with is not equal to 100 N. In order to find the force, we need to consider the work done against gravity. The work done against gravity is equal to the weight of the box multiplied by the vertical displacement. So, the work done against gravity is 300 N x 1.0 m = 300 J. Since work is equal to force multiplied by distance, we can rearrange the formula to solve for force: force = work / distance. Therefore, the force that the boy is pushing with would be 300 J / 3.0 m = 100 N.