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39.2*(t-2) - 0.5 (9.81) (t-2)^2 = 39.2* t - 0.5 (9.81) (t)^2
39.2*(t-2) - 0.5 (9.81) (t-2)^2 = 39.2* t - 0.5 (9.81) (t)^2
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