Space Time & Motion A.1 Kinematics (id: 2aec36944)

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 ball is released from rest and falls vertically for 3 seconds on Earth. Air resistance is negligible. What is the average speed of the ball during the motion?

A. 3 $ms^{-1}$
B. 20 $ms^{-1}$
C. 15 $ms^{-1}$
D. 30 $ms^{-1}$


参考答案:  C


本题详细解析:

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