本题目来源于试卷: Physics Unit2: Kinematics One Dimensional Motion，类别为 通用国际物理
[单选题]
Suppose a ball is th2ax /z7o3 py4jxvju.irown straight up, reaches a maximum height, thengeq)ke6jn ir0fx4,x* falls to its initial height. Make a statement about the directx6i r4q0ef, ex)*njk gion of the velocity and acceleration as the ball is going up.
A. Both its velocity and its acceleration point upward.
B. Its velocity points upward and its acceleration points downward.
C. Its velocity points downward and its acceleration points upward.
D. Both its velocity and its acceleration points downward.
参考答案: B
本题详细解析:
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