C. Find an expression for the energy represented by each bar. It will help to draw a free body diagram of your brother on the hill. D. What is the equation connecting the initial and final situations? E. Is your little brother going to have some fun today? Convert his speed at the bottom to miles per hour and decide if as a big brother, you would allow him to go sledding on that hill. * Consult an instructor before you proceed . III. Solving problems using energy bar charts. Using the method delineated in this tutorial, solve the following problems. A. You are pushing a box [:11 = 4 kg} horizontally with a constant force F = 30 N. After pushing it for a distance d = 5 m, it reaches a hill inclined at 6 = 25". How far up the bill will the box go if the coefficient of kinetic friction between the box and the road is pk = 0.4 and the hill is frictionless? KE Us Wext KEf Ugf Usf Mm