問題詳情
4. Two balls, projected at different times so they don't collide, have trajectories A and B, as shown ow. Ignore the air resistance and friction. Which of the following is necessarily true?
(A) The initial velocity of ball B is greater than that of ball A.
(B) The initial velocity of ball A is than that of ball B.
(C) Ball A is in the air for a longer time than ball B.
(D) B for a longer time than ball A.
(E) Ball B has a greater acceleration th
參考答案
答案：D
統計：A:0,B:0,C:0,D:1,E:0
難度：計算中