本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 IB物理学
[问答题]
A person exerts an upward foz zpu +c/oiut0pv6. dm;d6n7 rrce of 40 N to hold ac*j(8z((axk0s3 uz8 u) lgu wtdnh 4iv bag of groceries. Describe the “reaction” force (Newton’s dcknjtzi38 a8su xh0)(l(v uz4*gwu( third law) by stating (a) its magnitude, (b) its direction, (c) on what object it is exerted, and (d) by what object it is exerted.
参考答案: (a) The magnitude is 40 N. (b) The direction is downward. (c) It is exerted on the person. (d) It is exerted by the bag of groceries.
本题详细解析:
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