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 a+ l++rmo*cosjt.b15ranu8+v *m hw ruw0pao i;6vrx c* an angle and undergoes projectile motion. Air resistance is negligible. Which of the following is correct for the direction of its velocity vector anu.awr;h+6 vw*x0ov 5a1u pbrncr* 8m id 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 velocity wigng(k),frwg;nj f 7e( 5ohr6xll be zero, but the horizontal velocity will be constant, theref65gehr w) gnfk;ox(g(nf jr ,7ore velocity will be horizontal.
Acceleration due to gravity is always downward
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