Problem6
Section 4.4: Newton's Third Law of Motion: Symmetry in Forces (Test prep for AP® courses)

Question

A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 N. What happens next? (a) The ball accelerates downward with a force of 80.5 N.
(b) The ball accelerates downward with a force of 78.0 N.
(c) The ball accelerates downward with a force of 2.45 N.
(d) It depends on the height of the ceiling.

Question by OpenStax is licensed under CC BY 4.0

Final Answer

(a)

Solution video

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Comments

ShaunDychko·
This video was updated on Nov. 22nd, 2023
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kampei·
wouldn't the net force of acting on the ball be (mg) + the third law reaction? Why is the answer not (a)?
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ShaunDychko·
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
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