Physics Bowl by Topic 2: Kinematics - part I General Motion (id: 2e6187a7a)

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]
03.26:The accompanying graph describes t:j1:3a ve hzscq q2hx;he motion of a toyfslasjhhe ;6ff:jsy7i :7 c69 car across the floor for 10 seconds. At what times or time intervals must the net fcl sj6a:e79hf7s jf:iy;hf 6sorce on the toy car be zero?

A. at t = 4 s only
B. at t = 0 s, at t = 4 s and at t = 10 s only
C. from t = 2 s to t = 3 s and from t = 6 s to t = 9 s only
D. from t = 0 s to t = 2 s, from t = 3 s to t = 6 s and from t = 9 s to t = 10 s only
E. the entire time from t = 0 s to t = 10 s


参考答案:  C


本题详细解析: 暂无

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