The power lifter lifts a mass of 237.5 kg. The downward force exerted by the mass is given by F = m*g = 237.5*9.8 = 2327.5 N
To lift the mass the power lifter has to exert an equal force on the mass that is being lifted. This is equal to 2327.5 N. The mass is lifted to a height of 1.25 m.
Work done is equal to the product of the force applied and the distance the through which the force is applied. In the problem the work done is equal to 1.25*2327.5 = 2909.375 J
The work done by the power lifter to lift the mass of 237.5 kg to a height of 1.25 m is 2909.375 J