2. A 55kg snowboarder practises in a hemispherical half-pipe with radius 4.0m. Assume the half-pipe sides are frictionless. Determine (a) the potential energy of the snowboarder at the top of the half-pipe (b) the kinetic energy of the snowboarder at the bottom of the half-pipe (c) the potential and kinetic energy of the snowboarder at a point C if point C is 2.0m above the half-pipe bottom [6K] 2. A 55kg snowboarder practises in a hemispherical half-pipe with radius 4.0m. Assume the half-pipe sides are frictionless. Determine (a) the potential energy of the snowboarder at the top of the half-pipe (b) the kinetic energy of the snowboarder at the bottom of the half-pipe (c) the potential and kinetic energy of the snowboarder at a point C if point C is 2.0m above the half-pipe bottom [6K]