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 of time 8tdocx3v/d3:ccv .x e, a tennis ball is moved so thv1z,v5 x:opq nn 9zvl7yp4w3h at the angle between the velocity and the acceleration of the ball is kept at a constant 120 degre7w 5n , zn:vpzh14lqyxovpv9 3e. Which statement is true about the tennis 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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