本题目来源于试卷: Physics Bowl by Topic 4: Kinematics - part III Projectile Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
15.21: An object is launched from the ground at an n8ubd5a8aq,say 6d*2eiik +pnc3zv 0-e6qwl a dk;m,gq xwz 0eu -;n6hy4mrq/ngle of $60^{\circ}$ above the horizontal with a speed of 20.0 m/s. What is the magnitude of the average velocity of the object from just after launch until it reaches its highest vertical position during flight?
A. 13.7 m/s
B. 13.2 m/s
C. 10.0 m/s
D. 9.3 m/s
E. 8.7 m/s
参考答案: B
本题详细解析:
暂无
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