I drop my 600 g basketball from a height of 2.0 m and it rebounds to a height of 1.5 m. The collision with the ground takes 0.1 seconds. What is the magnitude of the force the ground exerts on the basketball during the collision? Hint: To find the average force acting on the basketball during the collision, you'll need to firs find the change in the momentum of the basketball from just before to just after the collision with the ground.