"You know what speed is. You would not believe a man who claimed to walk at 5 miles an hour, but took 3 hours to walk 6 miles. You have only to apply the same common sense to stones rolling down hillsides, and the calculus is at your command."

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Source : W. W. Sawyer (2012). “Mathematician's Delight”, p.137, Courier Corporation

W. W. Sawyer

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