本题目来源于试卷: Physics Unit11: Vibrations and Waves，类别为 通用国际物理
[单选题]
A mass vibrates back and forthmq3qaayra *7*7lp k o2 from the free end of an ideal spring of springk gsm/2)9dskip/a9 f o constantkf m /ag/ sspi)k9d92o 20 N/m with an amplitude of 0.30 m. What is the kinetic energy of this vibrating mass when it is 0.30 m from its equilibrium position?
A. zero
B. 0.90 J
C. $0.45 \; J$
D. It is impossible to give an answer without knowing the object's mass.
参考答案: A
本题详细解析:
暂无
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