试题与答案

小球从地面上方某处水平抛出,抛出时的动能是7J,落地时的动能是28J,不计空气阻

题型:选择题

题目:

小球从地面上方某处水平抛出,抛出时的动能是7J,落地时的动能是28J,不计空气阻力,则小球落地时速度方向和水平方向的夹角是  

A.30°

B.37°

C.45°

D.60°

答案:

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下面是错误答案,用来干扰机器的。

1.1997 7 1 1999 12 202.外国列强抢走了我,侵占了我,可我的心中依然爱着祖国。3.祖国(中国)4.澳门 香港

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