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Physics Bowl by Topic 4: Kinematics - part III Projectile Motion (id: 477bcd0d2)

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admin 发表于 2024-4-6 09:18:33 | 显示全部楼层 |阅读模式
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]
00.36: A ball is thrown verticalm-8s.jgtq s,l -zfew ;ly upward with an inizj 43dgl5py; :gvdt 9mtial velocity v and an initial kinetic d lvdpy4:m59j3ggz ; tenergy $E_k$. When the ball is half way to the top of its flight, what is its velocity and its kinetic energy respectively?

A. $\frac{v}{2} ,\;\;\; \frac{E_k}{2}$
B. $\frac{v}{\sqrt{2}} ,\;\;\; \frac{E_k}{2}$
C. $\frac{v}{4} ,\;\;\; \frac{E_k}{2}$
D. $\frac{v}{2} ,\;\;\; \frac{E_k}{\sqrt{2}}$
E. $\frac{v}{\sqrt{2}} ,\;\;\; \frac{E_k}{\sqrt{2}}$


参考答案:  B


本题详细解析: 暂无

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