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Physics

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An object initially at rest experiences an acceleration of 1.4m/s2 for 8.0s and then travels at that constant velocity for another 6.0s . What is the object’s average velocity over the 14s interval?

  • Physics -

    first stage
    v = a t = 1.4 * 8 = 11.2 m/s
    x = .5 a t^2 = .7 * 64 = 44.8 meters
    stage 2
    Vi = 11.2
    Xi = 44.8
    a = 0
    x = 44.8 + 11.2*6 = 112

    went 112 meters in 14 seconds
    112/14 = 8 meters/second average

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