Please answer and show all work

A 250.-kilogram car is initially at rest at point A on a roller coaster track. The car carries a 75-kilogram passenger and is 20. meters above the ground at point A. [Neglect friction. ] 75 kg -250. kg AAI C 20. m Ground 1. Compare the total mechanical energy of the car and passenger at points A, B, and C. (a) The total mechanical energy is less at point C than it is at points A or B. (b) The total mechanical energy is greatest at point A. (c) The total mechanical energy is the same at all three points. (d) The total mechanical energy is greatest at point B. 2. A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 x 105 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds. Calculate the height of the hill. [Neglect friction. ] 3