**87. Suppose the skateboarder shown in the drawing for Problem 38 reaches a highest point of h = 1.80 m above the right side of the semi- circular ramp. He then makes an incomplete midair turn and ends up sliding down the right side of the ramp on his back. When the skate- boarder reaches the bottom of the ramp, his speed is 6.40 m/s. The skateboarder's mass is 61.0 kg, and the radius of the semicircular ramp is 2.70 m. What is the average frictional force exerted on the skate- boarder by the ramp?

Question
**87. Suppose the skateboarder shown in the drawing for Problem 38
reaches a highest point of h = 1.80 m above the right side of the semi-
circular ramp. He then makes an incomplete midair turn and ends up
sliding down the right side of the ramp on his back. When the skate-
boarder reaches the bottom of the ramp, his speed is 6.40 m/s. The
skateboarder's mass is 61.0 kg, and the radius of the semicircular ramp
is 2.70 m. What is the average frictional force exerted on the skate-
boarder by the ramp?
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Transcribed Image Text

**87. Suppose the skateboarder shown in the drawing for Problem 38 reaches a highest point of h = 1.80 m above the right side of the semi- circular ramp. He then makes an incomplete midair turn and ends up sliding down the right side of the ramp on his back. When the skate- boarder reaches the bottom of the ramp, his speed is 6.40 m/s. The skateboarder's mass is 61.0 kg, and the radius of the semicircular ramp is 2.70 m. What is the average frictional force exerted on the skate- boarder by the ramp?

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