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 force of 40xtbj- s i4/*hx N to hold a bag of groceriesd+tby0 lp2b,l . Describe the “reaction” force (Newton’s third law) by stating (a) its magnitude, (b) its direction, (c) on what object it is exerted, and (d) by what object it btb+2 ylp0 d,lis 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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