本题目来源于试卷: Physics Unit6: Work and Energy，类别为 通用国际物理
[单选题]
A roller coaster start -oip5(nvigu2psf- /x y2fsh0 s from r spm7po7rp6 k.est at a point 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 s .o mppr 7p6s7klope, 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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