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 throoq2 gt4r7xf.;hxr e7 dwn vb1 n9uhn :qfk7yzz3-straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerk7uh y 9n :-1vnbzzfq3ation 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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