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
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統計: A(0), B(0), C(1), D(10), E(0) #3224650
統計: A(0), B(0), C(1), D(10), E(0) #3224650