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4th Equation of Motion. Start with the 1st Equation: ?x =?(vi vf)?tSolve for ?t ? 2 ?x = (vi vf) ?t ?t = (2 ?x)/(vi vf). 4th Equation of Motion. Substitute the expression for ?t into the 2nd Equation:vf = vi a?tvf = vi a(2?x/(vi vf)vf ? vi = a (2?x/(vi vf) (vf ? vi)(vf
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1. 4th Equation of Motion