Answer : The correct option is a car’s velocity changes from 25 m/s to 20 m/s in 5 seconds.

Explanation :

Acceleration : It is defined as the change in velocity divided by the time.

The formula of Acceleration is,

Acceleration=frac{text{ (final velocity)-(initial velocity)}}{Time}=frac{text{ Change in velocity}}{Time}

So, we can calculate the acceleration only for 2nd option which is a car’s velocity changes from 25 m/s to 20 m/s in 5 seconds.

In this option, velocities and time are given.

Acceleration=frac{(25m/s)-(20m/s)}{5s}=1m/s^2

In all the other options, the velocity and time are not given. So, we can not calculate the acceleration.

Hence, the correct option is a car’s velocity changes from 25 m/s to 20 m/s in 5 seconds.