The average acceleration of the car in this process is -2 m/s²
<h3>
What is Acceleration ?</h3>
Acceleration can be defined as change in velocity per time taken. It is a vector quantity. That is, it has both the magnitude and direction. It is measured in m/s²
Given that a velocity of a car decreases from 28m/s to 20m/s in a time of 4 seconds. Then,
- Initial velocity u = 28 m/s
- Final velocity v = 20 m/s
From the definition of acceleration,
a = Δv / t
a = ( 20 - 28 ) / 4
a = -8 / 4
a = - 2 m/s²
Therefore, the average acceleration of the car in this process is -2 m/s² which mean that the car is decelerating.
Learn more about Deceleration here: brainly.com/question/25311290
#SPJ1
