1. An object of mass of 4 kg is resting at a height of 2 m and then falls to the ground. a. Model the energy of the object-Earth system with Energy Bar Charts when at the initial height and ground level before hitting the ground. Use these to set up the calculations. b. Calculate the amount of gravitational energy the object-Earth system has while at the initial height. c. Calculate the change in gravitational energy of the object-Earth system as it falls from 2 m to the ground. d. What is the kinetic energy of the object just prior to hitting the ground?