4. A 1.2 x 103 kg Toyota Echo is accelerating down a hill. The hill is 150. m long and the total decline in elevation of the hill is 15 m. The car accelerates from a speed of 2.0 m/s at the top of the hill to an unknown speed at the bottom of the hill in 11 s. The power of the car is 9.6 kW, while the average retarding force of air resistance is 6.00 x 10 N. Find the speed of the car at the bottom of the hill. [5 marks] 5. Leviathan, the tallest roller coaster in Canada, is 93.3 m at its highest point. What is the maximum theoretical speed of the roller coaster? The top speed for the roller coaster is actually 41.1 m/s. What percentage of energy is lost to the surroundings? Name two types of energy lost to the surroundings. [5 marks]