Suppose the skateboarder shown in the drawing reaches a height of2.30 m above the right side of the semicircular ramp. He then makesan incomplete midair turn and ends up sliding down the right sideof the ramp on his back. When the skateboarder reaches the bottomof the ramp, his speed is 5.90 m/s. The skateboarder's mass is 58.0kg, and the radius of the semicircular ramp is 2.00 m. What is the average frictional force exerted on the skateboarder by the ramp?