Vertical Circular Motion on Excalibur Ride

[Yep]

Okay, I need to demonstrate circular motion of this ride(only the vertical rotation, not the spinning disc that holds the people):

http://www.sixflags.com/parks/stlouis/Rides/excaliber.html


I only really understand circular motion vaguely, I'm not sure whether this is uniform or non-uniform. The only thing I really know is the radius, do I need the mass?


Thanks in advance for any help...

 

[Yep]

Pretty please