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An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 3.1 m/s2. The magnitude of the car's velocity at the end of stage 2 is 2.8 times greater than it is at the end of stage 1. Find the magnitude of the acceleration in stage 2.

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