本题目来源于试卷: Physics Unit3: Kiematics Motion in Two Dimension & Vectors，类别为 通用国际物理
[单选题]
A jumper in the long-jump goes ingalxp v 0sf/h8 mr8yn )5pm w8f3ax:o0to the gcus2y1lusce lh71v: uwd th3 jh2c(hd8*(h * jump with a speed of 12 m/s at an angle sdudl* 23sc2tgj7hhu1ehv8uch w h( 1 c (:ly*of $20^{\circ}$ above the horizontal. How long is the jumper in the air before returning to the Earth?
A. $0.21 \; s$
B. $0.42 \; s$
C. $0.84 \; s$
D. $1.3 \; s$
参考答案: C
本题详细解析:
暂无
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