問題詳情

2.A ball is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle ofㆍ450. With what speed was it thrown? Use g = 10 m/s2. 


(A) 14m/s
(B) 20m/s
(C) 28 m/s
(D) 32 m/s
(E) 40 m/s

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增