A 61 {\rm kg} skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 {\rm m}. If the skier's...

A 61 {rm kg} skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 {rm m}.If the skier's speed at point A in the figure is 7.5 {rm m/s}, what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces.