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-gr n-le 4dlv9 5+ud eki4z*t0plzas)s) eiuy2dfz6 nlb h,1jtj8my1 f/9am mass is launched from the top of a cliff at an angle of a ) benj2 usi1fyl)jy91s d/f6 8zhm,t$15.9^{\circ}$ 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
| 
