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22 October, 21:57

A car is at an initial velocity of 100km/h [north] and has a constant acceleration of 4m/s^2 [south]. After 6 seconds what is its final velocity?

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  1. 23 October, 00:36
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    Use this kinematics equation:

    Vf = Vi + aΔt

    Vf is the final velocity, Vi is the initial velocity, a is the acceleration, and Δt is the elapsed time.

    Assign northward velocity/acceleration as positive and southward as negative. Given values:

    Vi = 100km/h = 27.8m/s

    a = - 4m/s²

    Δt = 6s

    Plug in the values and solve for Vf:

    Vf = 27.8 - 4 (6)

    Vf = 3.8m/s north
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