本题目来源于试卷: Space Time & Motion A.1 Kinematics，类别为 IB物理学
[单选题]
A basketball is launched at an angld1nfw6yvj,. q:bp kd 6e and undergoes projectile mzlf28, w azb(k1kl,l ity -a/yotion. Air resistance is negligible. Which of the following is correct for zylb(-k1f8/ wika z2aly,lt ,the direction of its velocity vector and its acceleration vector at the highest point of its trajectory?
what's the direction of velocity vector direction of acceleration vector respectively?
A. horizontal, no acceleration
B. no velocity, no acceleration
C. no velocity, downward
D. horizontal, downward
参考答案: D
本题详细解析:
At the top of its trajectory, vertical veloc w cs*2-1b.ajah( :5u nbf+dtw3asbwcity will be zero, but the horizontal velocity will be constant, therefore velocity will be horizontal.
Acceleration due to grs . h1wna*(sjabdbt w-cw+3c:b5af 2u avity is always downward
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