While rolling balls down an inclined plane, Galileo observes that the ball rolls 1 cubit (the distance from elbow to fingertip) as he counts to 10. How far will the ball have rolled from its starting point when he has counted to 20?

Solution 34E Step 1: In this question a ball in rolling down an inclined plane, which rolls down a distance of 1 cubit for 10 counts, we need to find the the distance travelled by the ball when the time us twice its initial time , that is after 20 counts