Question

The velocity of a car Travelling in the positive direction decreases from 36 m/s to 28 m/s in four seconds what is the average acceleration of the car in this process

Answer 1

Negative sign shows that velocity of the car is decreases at a constant rate
Step-by-step explanation:
We have given velocity of the car is decreases from 32 m /sec to 24 m/sec in 4 second
So initial velocity of the car u = 32 m /sec
And finally car reaches to a velocity of 24 m/sec
Time taken to change in velocity = 4 sec
So final velocity v = 24 m/sec
From first equation of motion v = u+at
So

Negative sign shows that velocity of the car is decreases at a constant rate