Answer:
Acceleration of the car is [tex]-5\ m/s^2[/tex]
Explanation:
It is given that,
Initial speed of the car, u = 20 m/s
Finally, it brought to rest, v = 0
Time taken, t = 4 s
We need to find the average acceleration over this time interval. The acceleration of an object is given by following formula as :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{-(20\ m/s)}{4\ s}[/tex]
[tex]a=-5\ m/s^2[/tex]
So, the car is decelerating at [tex]5\ m/s^2[/tex]. Hence, this is the required solution.
