the velocity acquired by a body moving with uniform acceleration is 12 m/s2 in 2 secs.and 18 m/s2 in 4 sec. find the initial velocity of the body?

Answer 1

vf=vi+at

Hmmm. I am wondering if you meant 12m/s and 18m/s. I will assume so.

12=vi+2a
18=vi+4a
subtract first from second equation
6=2a a=3 m/s^2

12=Vi+2*3 solve for vi