physics
posted by king .
A skateboard track has the form of a circular arc with a 3.20 m radius, extending to an angle of 90.0° relative to the vertical on either side of the lowest point, as shown in Figure 824. A 67.0 kg skateboarder starts from rest at the top of the circular arc

OK, so it is a "half pipe".
What is the question?
http://www.ehow.com/how_6467235_ridehalfpipeskateboard.html
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