摘要：12．在2007年中考体能测试中.某同学选择跳绳.他的质量为50kg.在1min内跳了120次.每次跳离地面的高度为5cm.设他每跳一次所用的时间相等.则他跳绳的平均功率约为 A．5W B．50W C．500W D．5000W 请用铅笔将选择题的答案在答题卡上涂上横线. 1 2 3 4 5 6 7 8 9 10 11 12 [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D]

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