III. Solving problems using energy bar charts. Using the method delineated in this tutorial, solve the following problems. A. Mary's 40 kg brother is at rest on a swing 0.50 m off the ground. Initial and final situation + forces She pulls him up until he is 2.0 m off the ground and releases him. How fast is her brother moving after he passes the bottom and has gone up to 1.5 m off the ground? KEi Ugi Usi Wother AEth KEr Ugr Usr B. A car moving at an initial speed w applies its brakes and skids for some distance until coming to a complete stop. If the coefficient of kinetic friction between tires and the road is / what distance did the car skid? Initial and final situation + forces KE Ug Usi Wother AEth KEr Ugr Usr