Roger is practicing for his upcoming boxing match with Mike. Roger spends an hour in the gym working with the punching bag, but finally stops because his hands hurt every time he punches the bag?

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Roger is practicing for his upcoming boxing match with Mike. Roger spends an hour in the gym working with the punching bag, but finally stops because his hands hurt every time he punches the bag. Which of Newton’s Laws does this demonstrate? How does this demonstrate that law of motion?