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]
A person exerts an upwardo +sa,sgz m0:v force of 40(x p0,pyjmvq -dx)k*c N to hold a bag of groceries. Describe the “reaction” force (Newton’s third law)mpvdq),* k(xyc 0pj-x 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.
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