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 forth from the free;;ovaca 1a j,g end of an ideal 5jz bve;t +7x7uuavqul)wx(f3k ; n*dspring of spring constant 20 N/m with an amplitude of 0.30 m. What is the kinetic energy of this vibr5;t* dlxfnk7;wv)b3 q+ zuxv u7( eujaating 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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