Please solve

4. Snoopy is flying his vintage war plane in a "loop the loop" path chasing the Red Baron. His instruments tell him the plane is level (at the bottom of the loop) and travelling with a speed of 180 km/h. He is sitting on a set of bathroom scales, and notes that they read four times the normal force of gravity on him. What is the radius of the loop? pos 220196 be g = 9 ( 18012 (a) 1102 m (b) 85 m (c ) 128 m Fi = 4m ( 180 ) ? - my (d) 255 m 4 xx (280) 2 9.6