本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 通用国际物理
[问答题]
When a golf ball is dropped to theha7pb-il k yj nr8u28rg)0gg/ pavement, it bounz:g xtl/45 /czbf5o vtces back up. (a) Is a force needed to make it bounce back up? (b) If so, whatzct/bzx4:vt /fl o55 g 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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