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 de t;( gbl3p:ru qn cy:3sscribes pg il;:y3 1u2;0xxj haoqso bu6 ;kc;pthe motion of a toy car across the floor for 10 seconds. At what times or time intervals ;p ihxc opy bo;;gq a120jus;ul:6xk 3must the net force 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:
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