Question

A remote control toy car starts from rest and moves with constant unkown acceleration. After half a second it has travel 0.65m. How far has it traveled after 3 seconds?

Answer 1

Vf^2=2ad
vf=at
so
(at)^2=2ad
a=2d/t^2=2*.65/(.5)^2

Now that you know a,
vf=at when t is three

Answer 2

and the distance it has went is
1/2 vf*time