PLEASE HELP ME WITH THIS PHYSICS ASSIGNMENT THERES A TIME LIMIT

Question 2 Use this diagram to answer the following question. Not yet answered The diagram shows a ball at rest on the top of a tall box. Diagram is not to scale. Time left 2:29:38 Marked out of 4.00 Flag question 6.85 m 0.750 m A ball with a mass of 1.26 kg is at rest on the top of the tall box. The ball is pushed off the tall box, bounces on the floor, and lands on top of the lower box. a) What is the initial gravitational potential energy of the ball relative to the floor? (1 mark) b) On its way down to the floor air friction acts on the ball. If the speed of the ball as it strikes the floor is 9.42 m/s, find the work done by the air friction. (2 marks) c) Using your answer in (b), determine the force of air friction acting on the ball. (1 mark)