1. The gure below shows a partial prole of a roller-coaster. The coaster begins from rest at position A at height hr = T51) in and h3 = 45.0 m. The speed of the roller-coaster at position C is 20 mfs. Energy is conserved. a) Determine the speed of the coaster at position B. ( f 3 marks) b) Determine the height of the coaster at position C. ( f 3 marks) 0) If speed of the roller-coaster at position A is 2.0 nr's. What is its speed at position B? ( f2 marks)