ACCELERATION After t hours of an 8-hour trip, a car has gone kilometers.a. Derive a formu...

ACCELERATION After t hours of an 8-hour trip, a car has gone kilometers.

a. Derive a formula expressing the acceleration of the car as a function of time.

b. At what rate is the velocity of the car changing with respect to time at the end of 6 hours? Is the velocity increasing or decreasing at this time?

c. By how much does the velocity of the car actually change during the seventh hour?