Question
A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 N. What happens next?
  1. The ball accelerates downward with a force of 80.5 N.
  2. The ball accelerates downward with a force of 78.0 N.
  3. The ball accelerates downward with a force of 2.45 N.
  4. It depends on the height of the ceiling.
Question by OpenStax is licensed under CC BY 4.0
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