A body travels from rest with acceleration 8cm^2 find its velocity when it covered a distance of 100m

Answer 1

distance= 1/2 a t^2 + Vo*t
100 =1/2 *.08m/s^2 * t Notice i changed 8cm/sec^2 to m/sec^2
t= sqrt (200/.08) = you do it.
now, Vf= a*t

Answer 2

or, to avoid two steps,
v^2 = 2as