If the velocity of the object changes from 3 cm / sec to 12 cm / sec in 12 seconds, then at what average rate is the velocity changing?
A ball rolling from rest down a constant incline requires 9 seconds to roll the 30 centimeter length of the incline.
An object which accelerates uniformly from rest will attain a final velocity which is double its average velocity.
An automobile accelerates uniformly down a constant incline, starting from rest. It requires 15 seconds to cover a distance of 156 meters. At what average rate is the velocity of the automobile therefore changing?