Question

A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 N. What happens next?

- The ball accelerates downward with a force of 80.5 N.
- The ball accelerates downward with a force of 78.0 N.
- The ball accelerates downward with a force of 2.45 N.
- It depends on the height of the ceiling.

Final Answer

(a)

### Solution video

# OpenStax College Physics for AP® Courses, Chapter 4, Problem 6 (Test Prep for AP® Courses)

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## Comments

wouldn't the net force of acting on the ball be (mg) + the third law reaction? Why is the answer not (a)?

Hi kampei,

Thank you very much for this great comment - you're quite right! I have updated the final answer with this correction and some explanation.

All the best,

Shaun

This video was updated on Nov. 22nd, 2023