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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
(b)
Solution Video

OpenStax College Physics Solution, Chapter 4, Problem 6 (Test Prep for AP® Courses) (0:55)

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Video Transcript

This is College Physics Answers with Shaun Dychko. This ball is hitting the ceiling of a gymnasium and it applies a force on the ceiling due to the ball of 78.0 Newtons. It's good to have subscripts like this to keep track of what is applying the force and I should say, what the force is being applied on and what is being applied by. This is a force on the ceiling due to the ball. The Newton's third law counterpart to this is the force on the ball due to the ceiling which is the subscripts switched around, and it's going to be in the opposite direction. This force has to be of equal magnitude 78.0 Newtons and the answer to this is B, this is a Newton's third law question.