A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. Find the magnitude of its acceleration.

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  1. average speed = (21 +30.9)/2 = 25.95 m/s
    so time = 191 m/25.95 m/s = 7.36 seconds

    a = change in velocity/change in time
    = (30.9-21)/7.36

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