A body starts from rest, moves in a straight line with constant acceleration, and covers a distance of 19.6 meters in 4 sec:
a) what is its velocity at t=4 sec?
b) How long did it take for the body to cover half the distance?
c) what distance was covered in half the total time?
d) what was the velocity when half the total distance had been covered?
e) what was the velocity in half the total time?