Physics Bowl by Topic 4: Kinematics - part III Projectile Motion (id: 94f4931f6)

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 launcp //yc+0vue1 qysg kk4d :fy.qhed from the top of a cliff at autt+w0m( tja-- nkf 2 +jurqy.n angle of+turwt -ju-t.+ 2ja(n0qky fm $15.9^{\circ}$ 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

微信扫一扫，分享更方便