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A car is traveling along a straight road at a velocity of +46.9 m/s when its...

A car is traveling along a straight road at a velocity of +46.9 m/s when its engine cuts out. For the next twelve seconds the car slows down, and its average acceleration is a1 . For the next six seconds the car slows down further, and its average acceleration is a2. The velocity of the car at the end of the eighteen-second period is +31.2 m/s. The ratio of the average acceleration values is  . Find the velocity of the car at the end of the initial twelve-second interval.

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