Grade 9 Test on Mechanics 20241217 (id: eb5176505)

[单选题]
A roller coaster stars8pign0o8*ibv /zq/oh(o-4 r5er akg ts from rest at a -7evr t 0urzbl rd w(m7r-4w(bpoint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next (wmr 0er4dvbwz-(7t rr7b u-l 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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