A roller coaster cart with a mass of 125 kg is moving with a speed of 3.0 m/s at position A which is 5.0 m above the ground. a) What is the total mechanical energy of the roller coaster at Position A? b) What maximum height could the cart reach at Position C, assuming that the cart comes to a brief stop at C? c) From C, the car slides down the final ramp to a height of zero. If the final ramp has an efficiency of 85%, what will be the speed of the car at the bottom? *Find your answer and upload a picture of ALL your workings** A 5.0 m. B