# An automobile accelerates at 4 m/s^2 from 20 m/s to 36 m/s. How long did that acceleration take?

Aug 13, 2017

$4 s$

#### Explanation:

According to the given information,

acceleration 'a' = 4 m/${s}^{2}$
initial velocity 'u' = 20 m/s
final velocity 'v' = 36 m/s

Now, I have to find how long the acceleration of the automobile takes place.
refer that 't' is time taken

Using equation,
$v = u + a t$

$\Rightarrow 36 = 20 + 4 t$

value of 't' comes out to be 4 s.