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What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 7.1 m/s when going down a slope for 4.0 s?

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    Average acceleration is given by the expression
    (final velocity - initial velocity) / time
    Note the use of the word velocity instead of speed, since the direction of the movement is important.

    In the case of a skiier going downhill, the direction of the speed does not change, so the average acceleration reduces to:
    (7.1-0 m s-1)/4s = ? m s-2

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