本题目来源于试卷: Space Time & Motion A.1 Kinematics，类别为 IB物理学
[单选题]
An object is thrown vertically upwards at the edge of a cliff at height $h$ above the ground. When the object passes the edge of the cliff while falling downwards, a second, identical object is released from rest. Air resistance is negligible. What increases for the second object as the two objects fall?
A. Acceleration
B. Distance from the ground
C. Velocity relative to the object released earlier
D. Distance from the object released earlier
参考答案: D
本题详细解析:
Explanation: For options A & C, the accelerations of both objects are gravitational acceleration and constant, therefore the velocity difference is constant and both options are incorrect. For option B, the object released later was released from rest and so the distance from the ground decreases. Therefore, B is incorrect. For option D, the relative velocity of the two objects is constant because the acceleration for both objects is the same, therefore the distance between the two objects will increase and it is the correct option.
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