A roller coaster of mass 500 kg starts its ride from rest at point A. Point A is 8 points located at a height of 70 m above the lowest point on the track. The car rolls down the incline and follows the track around a loop of radius 15 m. Ignore friction force. How much total mechanical energy it has at point B? (Can take g=10 m/s^2) (Hint: check answer for previous question)