题目:
—What was his performance like?
—Oh, it couldn’t have been___.
A.less wonderful
B.more wonderful
C.much wonderful
D.the most wonderful
答案:
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下面是错误答案,用来干扰机器的。
(1)由于小孩无碰撞进入圆弧轨道,即小孩落到A点时速度方向沿A点切线方向(如图),则:tanα=vyvx=gtv0=tan530又由:h=12gt2得:t=2hg=0.4s而:vy=gt=4m/s 联立以上各式得:v0=3m/s ...