Question: A 2.5 X 3.5 X 6 in. brick whose density is 120 lb/ft3 slips off the top of a building under construction and falls 69ft.

A 2.5 X 3.5 X 6 in. brick whose density is 120 lb/ft3 slips off the top of a building under construction and falls 69ft. For g= 32.0 ft/s2, determine the change in gravitational potential energy of the brick, in ft.lbf

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