Question

A.
1
S = ut +
1/2
at2
i. u as subject.

Answer 1

`s = ut + (1)/(2) at^(2) \\ ut = s - (1)/(2) a {t}^(2) \\ u = (s - (1)/(2) a {t}^(2) ) / t \\ u = (s - (1)/(2) a {t}^(2) ) * (1)/(t) \\ \\ u = (s)/(t) - (1)/(2t) a {t}^(2) \\ \\ u = (s)/(t) - (1)/(2) at \\`

I hope I helped you^_^