15.0 kg stone slides down the hill {see the gure), leaving the point A at a speed of 10.0 mfs. When the stone reaches point B its speed is 15.0 mls. In the horizontal region that, the stone runs into a very long, light spring with force constant of 2.0 Nim. By the time the spring is compressed to the maximum the stone has traveled 100 m (measured from point B to the point where the spring is compressed to the maximum) on the horizontal surface. The coefcient of kinetic friction between the stone and the horizontal ground is 0.11. a.) What is the work done by friction as the stone moves from point A to point B? b.) What is the maximum compression of the spring