本题目来源于试卷: Wave Behavior C.1 Simple Harmonic Motion，类别为 IB物理学
[单选题]
An object on a horizontal spring pg5suia+a33 z cerforms simple harmonic motion. Thkto f8mj+ 9iy7e position of the object as a function of timetyo78 jifmk9+ is given by $x=5\cos (2t).$
Which of the following expressions gives the acceleration of this object as a function of time?
A. $x=-5\sin (2t).$
B. $x=20\sin (2t).$
C. $x=20\cos (2t).$
D. $x=-5\cos (2t).$
参考答案: D
本题详细解析:
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