Space Time & Motion A.2 Forces & Momentum (id: 7855619d0)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[单选题]
A car makes a U-turn on a flat26db4 k gomf4w hor :q ju 8iv9 0nkjr.d,6gafvna/izontal road at a speed of $9m{s}^{-1}$ as shown in the diagram.



The inner radius of the U-turn is $4m$ and its outer radius is $10m$.
What is the best estimate for minimum acceleration of the car when making the U-turn?

A. $0.9m{s}^{-1}$
B. $2.2m{s}^{-1}$
C. $8.1m{s}^{-1}$
D. $20.2m{s}^{-1}$


参考答案:  A


本题详细解析:

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