Answer to Question #97691 in Algebra for belle

Question #97691

Make the subject of the formula S=ut+1/2 at2


1
Expert's answer
2019-11-12T12:29:29-0500

S=ut+12at2u=1t(S12at2)a=2(Sut)t2t=u+u2+2aSa  or  t=uu2+2aSaS=ut+\frac{1}{2}at^2\\u=\frac{1}{t}(S-\frac{1}{2}at^2)\\a=\frac{2(S-ut)}{t^2}\\t=\frac{-u+\sqrt{u^2+2aS}}{a}\;or\;t=\frac{-u-\sqrt{u^2+2aS}}{a}

Since t0t\ge0, if a>0, only the first solution is valid, if a<0 both solutions are valid.


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