Solve the all parts of given question:
Question: A 140-g baseball is dropped from a tree 13.0m above the ground.
Part I: With what speed would it hit the ground if air resistance could be ignored?
Part II: If it actually hits the ground with a speed of 8.50m/s, what is the magnitude of the average force of air resistance exerted on it?
I need help to find the magnitude of the average force of air resistance exerted on it.