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 comes flying over thvyhwaw)n :t d ;*9.fajzia (ylzeq+9dn rhk e4z slo4; m-5kur4in+ 54e crest of a small hill, as shown in Fig. 5–31. His sled does not leave the ground (he does not achieve “air”), but he feels the normal force between his chest and the sled decrease as he g l4e;q+n h-ak(94 rz o5+nm4yuiz4iszle5 rkdoes over the hill. Explain this decrease using Newton’s second law.

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