1. The figure below shows a partial profile of a roller-coaster. The coaster begins from rest at position A at height hA = 75.0 m and he = 45.0 m. The speed of the roller-coaster at position C is 20 m/s. Energy is conserved. a) Determine the speed of the coaster at position B. ( /3 marks) VC hA VB C B hB hc b) Determine the height of the coaster at position C. ( /3 marks) c) If speed of the roller-coaster at position A is 2.0 m/s. What is its speed at position B? /2 marks)