【单选题】
In a 1901 circus performance, Allo “Dare Devil” Diavolo introduced the stunt (绝技) of riding a bicycle in a loop-the-loop. Assuming that the loop is a circle with radius R = 2.7 m, what is the least speed v in m/s that Diavolo and his bicycle could have at the top of the loop to remain in contact with it there?
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