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

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