Distance formula with acceleration and time

The formula of distance is

S = ut + (1/2)at²
Here, S = distance
          u = initial velocity
          a = acceleration
and  t = time

How do you find distance when given acceleration and time?

Question 1: A car starts from rest with constant acceleration of 2ms⁻² for 6 second. Calculate the distance travelled with constant acceleration.

How do you find final velocity with acceleration and time?

Question 2: an object from rest travels the distance 50 m in 5 seconds with uniform acceleration.what will be the velocity of the object after 15 seconds?