new new new new (id: 27df849c9)

本题目来源于试卷: new new new new，类别为 IB物理学

[问答题]
A child on a sled co xyet:)+ gh cxt4k-:cbsb(p9qmsrpij *rw a; ninv9idn:v5ol0 dnqyz*00) ):ces flying over the crest of a small hill, as shown in Fig. 5–31. His sled does not leave sy:*nirol:dzw0i)qrnv5);c0jp *ai0 9n ndv the ground (he does not achieve “air”), but he feels the normal force between his chest and the sled decrease as he goes over the hill. Explain this decrease using Newton’s second law.

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