A downhill skier, whose mass is 50.0kg, attains a speed of 21.0 m/s just as she reaches point A where a jump is necessary. When the she leaves the ground her velocity is horizontal. Point A is at the bottom of an imaginary circle a portion of which intersects the slopes surface in an arc AB. The radius of the imaginary circle is 27 meters. Determine the normal force acting on the skier at point A.