(1)大象身上的重力為g = mg = 6×103kg×10n/kg = 6×104n；
(2)大象對地面的壓力為p = f s = g s = 6×104n 0.06 m2 = 1×106 pa；
(3)吊車對大象做的功W有用= GH = 6×104n×2m = 1.2