I'm to assume my budget is whatever I need, but the mechanism should be something that needs to be built from materials. Also the speed is unspecified but quickly should be quick enough to suddenly rise up and seemingly smack an actor in the crotch. I would say slow should be rather gradual.How quick is quickly and how slow is slowly? What is your budget?
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The platform beneath the object is 2 feet off the ground and 20 feet x 20 feet in terms of length and width. The object isn't given specific dimensions. It's supposed to be a tombstone and I'm imagining it at 2 feet, 6 inches tall and 1 foot, 10 and 1/2 inches wide.
Assuming you have access under stage, your tumb stone is built laying flat into floor. It Is a door that opens up. Use concealed hinges, and on back side add an angle bracket with hand lever.