Question

a car accelerates from rest at 3.6m/s^2. how much time does it need to attain a speed of 7 m/s? awnser in units of s.

Answer 1

General formula is acceleration= velocity / time 
acceleration / velocity = time 
3.6 / 7 = time
0.514 seconds = time 

Answer 2

Initial velocity: 0
final velocity: 7 m/s
a = 3.6
t = ?
x = ?

(7-0)/3.6 = t
t = 1.94 s