Bed of nails

Sledge Hammer and Large Mass. A large Mass (18.95 Kg) is placed on the supine Professor's abdomen. A student strikes the mass with a sledge hammer. Because the mass has a lot of inertia, and the force is distributed over a large area,-the professor sustains little damage. Note: At one time, this experiment was performed with the professor lying on a bed of nails.
UCB Index: 
A+20+20
PIRA Index: 
1F20.25
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