本题目来源于试卷: Physics Unit6: Work and Energy，类别为 通用国际物理
[单选题]
A projectile of mass m leaves the ground with a7xiy:(y7ei3+e b fuu )hyqxhk q:7 r:jhy31y x kinetic energy of 220 J. At theju b:xehh(q)3i 3ry7+qeku ::h7yiyy x 1x y7f 5g5b/zou kvz+ highest point in its trajectory, its kinetic energy is 120 J. oz5u/bk+ vz5g To what vertical height, relative to its launch point, did it rise?
A. $\frac{220}{mg} \; m$
B. $\frac{120}{mg} \; m$
C. $\frac{100}{mg} \; m$
D. Impossible to determine without knowing the angle of launch
参考答案: C
本题详细解析:
暂无
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