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]
11.14: A car makes a trix 8z5wkwt8 e wd+ hom;y+wyk3:p sth2t. z3a+0 fiqe b*:)f wb.k9b uijq a0fgy-in two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?
A. 7.7 m/s
B. 10.4 m/s
C. 12.0 m/s
D. 13.6 m/s
E. 17.3 m/s
参考答案: A
本题详细解析:
暂无
| 
