A skateboarder starts from the side of a circular ramp of radius r = 4 meter and travels downward. He would like to have the normal force on him be five times as large as his weight at the bottom of the ramp.
(a) Draw a free body diagram for the skateboarder at the bottom of the ramp. Your arrows must be the correct length.
(b) Determine how fast must he be going at the top of the ramp therefore that the normal force is five times his weight at the bottom?