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2: Vocabulary about “hand motion”

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3: Vocabulary about “feelings and emotions”

4: Vocabulary about “ways of speaking”

Match the expressions in Column A with the definitions in Column B.

质量为5Kg的铁锤以5m/s的速度打击钉子，若打击后铁锤被反弹的速度为-1m/s，铁锤与钉子的碰击时间为0.01s，则铁锤对钉子的平均打击力为_________N。