5. A box of mass 5.5 kg is released from rest at a height (h) of 6.0 m and travels a frictionless path along a loop-the-loop track until it reaches a section of the path at the end of length Las shown. In this section (L) the coefficient of kinetic friction is 0.40. a) If the radius if the loop is 1.2m what will the velocity of the box be a point A. b) If the box stops sliding at the very end of the section L, how long is L?