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 angle and undergoes projeci+7n f1rpq no(c0bj -7inll/dtb* e jnr:8k6*hj lw5yyile motion. Air resistance is negligible. * yljn* jb8y5we6h:r kWhich of the following is correct for 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 velocb3u8rmdr )o* 4ivub /oity will be zero, but the horizontal velocity will be constant, therefore velocity will be /d )o8mb4vr3uuib *o rhorizontal.
Acceleration due to gravity is always downward
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