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]
14.40: A small 1.35-gram mass is la (krq k0geu n2377csk sunched from the to b om.irsd 0a.+p of a cliff at an angle of m.oibadr s.+0$15.9^{\circ}$ above the horizontal. When the mass reaches the ground 4.33 seconds later, its velocity is directed at $34.4^{\circ}$ below the horizontal. What is the speed of the mass when it reaches the ground? (ignore air resistance)
A. 60.7 m/s
B. 54.1 m/s
C. 46.4 m/s
D. 43.3 m/s
E. 38.8 m/s
参考答案: B
本题详细解析:
暂无
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