A hockey puck has a mass of 0.170 kg; a soccer ball has a mass of 0.425 kg; a baseball has a mass of 0.145 kg; and a tennis ball has a mass of 0.0575 kg. Suppose these objects were approaching your knee with the same velocity. Based on the most relevant quantity of motion, you would least likely need protection from the
Answer: tennis ball with a mass of 0.0575 kg.
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