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A train with a constant velocity of +30 m/s approaches a small town. The operator applies the brake, reducing the train's velocity to +10 m/s.

  1. A train with a constant velocity of +30 m/s approaches a small town. The operator applies the brake, reducing the train's velocity to +10 m/s. If the average acceleration of the train during braking is -2 m/s2, for what elapsed time does the operator apply the brake?

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