The Cannibal rollercoaster at Lagoon amusement park, in Utah, features a 63.0-m enclosed tower that takes you to the top of the ride, a beyond-vertical drop of 116 degrees, a themed underground tunnel, and a 360-degree helix situated above a man-made waterfall. (source: Wikipedia). If the ride starts from ground level

(a) What is the potential energy of a 450.0-kg car (with passengers) at the top of the tower? (You can ignore the angle of inclination and assume it is a vertical rise.)

(b) If the car dropped vertically from this height, what would the velocity be at the bottom of the descent?