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A ball rolling across a field with an acceleration of -0.5 m/s rolls 12.5 m and then comes to a stop after 8 seconds.
What was the ball's initial speed?

  • physical -

    deceleration rate * time = Initial speed
    = 4 m/s.

    It should come to rest after rolling a distance (average speed)*(time) = 16 meters.

    You have been given more infrmation that you need, and some of it is inconsistent.

    Your deceleration rate also has the wrong units. m/s is not correct units for acceleration

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