本题目来源于试卷: newnewnewnew，类别为 IB物理学
[问答题]
When a golf ball is dropped to the 0t2npz;zfs r n(s( ;y,tsan 7zg2 kmeb1k3 z8cpavement, it bounces back up. (a) Is a force needed to make it bounce back up? (b) If 3ckm82ezk bg1so, what exerts the force?
参考答案: (a) A force is needed to bounce the ball back up, because the ball changes direction, and so accelerates. If the ball accelerates, there must be a force. (b) The pavement exerts the force on the golf ball.
本题详细解析:
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