Use this scenario to answer the four following questions. a person is on a sled on top of a snow covered hill. the vertical distance from the top of the hill to the bottom is 12 meters. the sled and the person riding it have a combined mass of 60 kg. to start, person is pushed. the initial velocity is 1 m/s. at the bottom of the hill, the sled and the person have a velocity of 10 m/s. use g=9.8 m/s2 or g=10 m/s2 for the gravitational acceleration. what is the initial total mechanical energy of the person and their sled?