physics

A car begins at rest at t0 = 0. The car starts moving and finally covers a distance d = 617 m in a time tf = 105 s. In a coordinate system with north being the positive x-direction, the car's motion is in the southern direction. What was the car's average speed during this period, in meters per second?.

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  1. average velocity = -617/105
    = -5.88 m/s
    and
    average speed = 5.88 m/s
    ================================

    in anticipation of a part B:
    x = Xi + Vi t + (1/2) a t^2

    -617 = 0 + 0 t + (1/2)a (105)^2

    a = -1234/105^2

    a = - .112 m/s^2

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