A car take 8s to increase it's velocity from 10m/s to 30m/s. what is its average acceleration?

As the car is changing its velocity per seconds hence acceleration will be produced now we have to find average acceleration which is equal to = total change in speed/total time

as car is moving with initial velocity 10m/s and final velocity 30m/s

total time is 8 sec

now = final-intial velocity/toatal time

=30-10/8

=2.5 m/sec^2

hence the average velocity of car is 2.5m/sec^2