Answer:
48m/s
Explanation:
First, you have to identify the information the problem is giving you. A car starting from rest means that the initial speed is 0m/s. You also know the acceleration which is 12m/s² and the time which is 4s.
You can use the following formula to calculate the final speed:
Vf = Vo + at
The known values are:
Vo = 0m/s
a = 12m/s²
t = 4s
And now you substitute in the formula
Vf = 0m/s + (12m/s²)(4s)
Vf = 48m/s
So the final speed is 48m/s
