Newton’s law of motion (id: 55ac539c1)

本题目来源于试卷: Newton’s law of motion，类别为 美国物理杯赛(Physics Bowl)

[单选题]
02.29: Assume the rollercoa; 0;e/p mcykirtx15jfh6y uk-ster cartrolls frictiouaho4;3l-)sbv9gp/,(t wm. ktkzwhp nlessly along the curved track from p-4g s w(kpmu/h tkw;9phtavl3o) bz., oint A to point C under the influence of gravity. What would be the direction of the cart's acceleration at point

A. upward
B. downward
C. forward
D. backward
E. no acceleration


参考答案:  A


本题详细解析: 暂无

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