Grade 9 Test on Mechanics 20241217 (id: eb5176505)

[单选题]
A roller coaster startf p :+mmvvt j6gmiel o5y++)f8s from rest at0y 2afu7022up lio;em knugi8/3/uwpie5t sy a point 45 m above the bottom of a dip (Seeawy75i s0m nlguteki/ 23p0/2u pf u;ueo 82iy Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

A. 14 m/s
B. 17 m/s
C. 24 m/s
D. 30 m/s


参考答案:  B


本题详细解析: 暂无

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