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]
06.22: During an interval ofua59fndd 4 ff3 time, a tennis ball sk/u0-hbsv5v is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the thvb s0ks-v5 u/ennis ball during this interval of time?
A. Its speed increases and it is changing its direction of travel.
B. Its speed decreases and it is changing its direction of travel.
C. Its speed remains constant, but it is changing its direction of travel.
D. Its speed remains constant and it is not changing its direction of travel.
E. Its speed decreases and it is not changing its direction of travel.
参考答案: B
本题详细解析:
暂无
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