A ball falling from rest is located 45 m below its starting point 3.0 s later. Assuming that its acceleration is uniform, what is its value?

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  1. X = (1/2) a t^2
    t is the time spent falling, and a is the acceleration. Solve for a using X = 45 m and t = 3.0 s.

    a = 2X/t^2 = 90 m/9s^2 = 10 m/s^2

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