1. A block is initially at position x = 0 and in contact with an uncompressed spring of negligible mass. The block is pushed back along a frictionless surface from position x = 0 to x = - D, as shown, compressing the spring by an amount Ax = D. The block is then released. At x = 0, the block enters a rough part of the track and eventually comes to rest a position x = 3D. The coefficient of kinetic friction between the block and the rough track is . XXXXXXX -D 0 3D a) On the axes, sketch and label graphs of the following two quantities as a function of the position of the block between x = - D and x = 3D. You do not need to calculate values for the vertical axis, but the same vertical scale should be used for both quantities. (Hint: Draw energy LOL diagrams. Using variables, determine the proportionality between spring potential energy and distance, and the proportionality between kinetic energy and distance.) i. The kinetic energy K of the block. ii. The potential energy U of the block-spring system. Energy -D 2D -X 3D