Intro To Energy Assignment 1. How much work is done by a 6800 kg bus that accelerates from 10 km/h to 50 km/h over a distance of 120 m? Express your answer in kJ. [4 marks] 2. In the movie the Princess Bride the Dread Pirate Roberts climbs the Cliffs of Insanity in pursuit of the evil Vizzini who has captured the Princess Buttercup. The cliffs are 400 m tall. Halfway up the cliffs Roberts is travelling at 1.0 m/s. If Roberts has a mass of 72 kg what is his total mechanical energy halfway up? [4 marks] 3. Mr. Mitchell is enjoying his summer break and is visiting Canada's wonderland. If all of his energy is conserved in the form of mechanical energy as he rides the Leviathan, complete the following problems. a. What is his total energy when he is at rest at the top of the initial 93.3 m drop? His mass is 68 kg. [2 marks ] b. What is his speed halfway down the initial drop in km/h? [4 marks] c. If he stays on the roller coaster after he rides it the first time and goes back up to the top of the first hill, what amount of work has the roller coaster done on him? Explain your reasoning. [2 marks] 4. A golf club with 65 J of kinetic energy strikes a stationary golf ball with a mass of 46 g. The energy transfer is only 20 % efficient. Calculate the initial speed of the golf ball after the energy has been transferred. [6 Marks]