本题目来源于试卷: Physics Bowl by Topic 2: Kinematics - part I General Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
07.17: A toy car moves along the x-axis according to the veloci mf,v6n: hk-7 i;xe zmmty versus t a :61b1a f4r/w;9 gxssg xf0quzmhs2vime curve : s a0s1h;1q9gvf 6xfbmuwx/2grzas4 shown to the right. When does the car have zero acceleration?
A. at 2 and 4 seconds
B. at approximately 3.0 seconds
C. at approximately 3.3 and 5.1 seconds
D. the acceleration is always zero
E. at no time
参考答案: A
本题详细解析:
暂无
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