本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 通用国际物理
[单选题]
A curve of radius 80 m+m msb 5wc4(hvzc-r*rm6 2 unn is banktc)l s1c5k oor;8 q7jq0gx:lm (xq 0yred at $45^{\circ}$. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the safe speed with which to take the curve without either sliding up or down?
A. 9.4 m/s
B. 28 m/s
C. $7.8 \times 10^{2} \; m/s$
D. The curve cannot be taken safely.
参考答案: B
本题详细解析:
暂无
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