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一弹簧振子,重物的质量为m,弹簧的倔强系数为k,该振子作振幅为A的简谐振动,当重物通过平衡位置且向规定的正方向运动时,开始计时,则其振动方程为

单选题
2021-09-01 23:34
A、1373958505031.jpg
B、1373958511640.jpg
C、1373958520500.jpg
D、x=Acos( √m/kt-π/2
E、1373958536250.jpg
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正确答案
D

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