如图质量为20kg的小孩坐在秋千板上小孩离拴绳子的栋梁2m.如果秋千板�到最低点时速度为3ms问小孩对秋千板的压力是多大如果绳子最大 Template




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tomski如图质量为20kg的小孩坐在秋千板上小孩离拴绳子的栋梁2m.如果秋千板�到最低点时速度为3ms问小孩对秋千板的压力是多大如果绳子最大 coloring