Question

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

Answer 1

`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 + at`

`rArr 36 = 20 + 4t`

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