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NO.1407
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题目来源 : 新版数学

Starting from rest, a certain car travels a distance of P meters in t seconds, where P=5r² and 0<P≤320. In how many seconds does the car travel 320 meters, starting from rest?

Enter your answer as an integer or a decimal in the answer box. Backspace to erase.
__________seconds

Enter your answer as an integer or a decimal in the answer box. Backspace to erase. 

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