问:关于荡秋千,下列四种说法中正确的是(). A.重一些的人荡秋千,秋千摆动的频率会更大一些 B.荡秋千达到最低点处人有失重的感觉 C.拉绳被磨损了的秋千,绳子最容易在最低点处断开 D.荡秋千时,应在两侧最高点提高重心,增加势能 所给答案为C、D.而对于D,按理论分析,在最高点提高 Q: Regarding swinging, the correct answer in the following four statements is (). A. Those who are heavy will go to the swings, and the swings will swing more frequently. B. The swing to the lowest point where the people feel weightless C. Pull The rope is worn on the swing, the rope is most likely to break at the lowest point. D. When swinging, you should raise the center of gravity at the highest points on both sides. Increase the potential energy to give answers of C, D. For D, according to theoretical analysis, The highest point increases