1/2 [vo + (v0 + at)]t ?
please explain every step
1/2[Vo + (Vo + at)]t,
Start on inside by removing parenthesis
first:
(1/2)t[Vo + Vo + at],
Combine like-terms:
(1/2)t[2Vo + at],
Remove bracket by multiplying each term
inside the bracket by (1/2)t:
Vo*t + (1/2)at^2.