1125-kg car and a 2250–kg pickup truck approach a curve on the expressway that has a radius of 225 m. At what angle (ROUNDED-OFF TO WHOLE NUMBERS) should the highway engineer bank this curve so that vehicles traveling at 65.0 miles per hour can safely round it regardless of the condition of their tires? (1.609 km = 1 mile)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!