A 63.1 kilogram skier coasts up a snow-covered hill that makes an angle of 26.4 degree with the horizontal. The initial speed of the skier is 9.91 meter per second. After coasting a distance of 2.27 meter up the slope, the speed of the skier is 4.64 m/s.
(a) Determine the work done by the kinetic frictional force that acts on the skis.
(b) Obtain the magnitude of the kinetic frictional force?