A ball rolls across a table and stops due to rolling friction. It has a mass of m and travels a distance of s in the time t. What is the ball's initial speed? The same ball rolls until it hits a wall. It has a mass m, and travelled a total distance of s (to the wall) in the time t. What is the ball's initial speed? At what speed does the ball hit the wall? I have formulated my question into a textbook-style question since that seems to be the rules here. I just wanted to know if the deceleration of a ball rolling a cross a table is typically constant.