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]
17.32: A projectile is launched at an angle of qs ke-ek 9ihr.,i2(lx40° above the horizontal with a ya52hxg t.o/+z m-tej 2dahq2d /tgv9, d-eakspeed of 30 m/s . How much time passes before the position of the proj-2t/ et/md eg h dyg2j,o2 kvxa5.-zd+ta9aqhectile makes an angle of 20° above the horizontal from the original launch point?
A. 3.02 s
B. 2.38 s
C. 2.18 s
D. 1.93 s
E. 1.64 s
参考答案: C
本题详细解析:
暂无
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