41. A steel ball rolls from rest down a 20.0 m long slope and over a 25 m long level surface. It takes 4.0 s to roll down the slope. a. Calculate the average speed on the slope. b. Calculate the speed at the bottom of the slope. c. Calculate the acceleration provided by the slope. 20.0 m d. Calculate the time taken on the level portion. 25.0 m e. Calculate the average speed for the entire roll. 42. A rocket is fired straight up from ground level with a constant acceleration of 32 m/s2 until the engine runs out of fuel at 2.7 s. Neglecting air resistance, find the maximum height the rocket will attain and the total time of flight (until it lands on the ground)