Question

The velocity of a car decreases from 28m/s to 20m/s in a time of 4 seconds. what is the average acceleration of the car in this process?

Answer 1

The average acceleration of the car in this process is -2 m/s²

What is Acceleration ?

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

• Time t = 4 s

• Acceleration a = ?

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

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