Question

A car accelerates from rest at 3.6 m/s 2 . How much time does it need to attain a speed of 5 m/s?

Answer 1

car starts from rest

`v_i = 0`

final speed attained by the car is

`v_f = 5 m/s`

acceleration of the car will be

`a = 3.6 m/s^2`

now the time to reach this final speed will be

`t = (v_f - v_i)/(a)`

`t = (5 - 0)/(3.6)`

`t = 1.39 s`

so it required 1.39 s to reach this final speed