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what is the difference between a constant velocity of 6 m/s and a constant accerleation of 6 m/s2?

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    One requires that a force be applied and the other does not.

    Compare what it is like to be accelerating or decelerating in an elevator, compared to moving at constant speed. Big difference.

    The object that is accelerating will be traveling much faster after one second in your example.

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