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 n8yv(6tepj:4hbvga 7is lau 6*q5w3 v(x2zxbmp9vbv ev bztx,71honched at an angle of 40° above the horizontal with a speed of 30 m/s . How much time passes before the position of the projectile makes an angle of 20° above the horizontal from the original (2vm vq5p , 6xoxbbz9zx1t*hve7w3v blaunch 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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