Question: When many collisions occur at a steady rate, one after the other, it is useful to describe the average force that they exert over time. We will use this idea of averaging when we study gases. Suppose 20 baseballs are thrown at a wall in 5 s and that each rebounds from the wall with the same 24.6m s-1 speed that it came in with. Find the average force exerted on the wall during the 5 s.