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A dog running in the +y-direction at 6.6m/s hears its owner call from behind, and 3.0secs later it's running at the same speed in the opposite direction.

Compute the dog's change in velocity.
Compute its average acceleration.

  • Physics -

    Change in velocity = -3 - 6.6 = -9.3 m/s

    Acceleration = (-9.3 m/s)/3.0s = -3.1 m/s^2
    (minus means backwards compared to the +y direction)

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