Given that work is the vectorial product of displacement and force. Work can be found with the formula W=F·d
The force that does work as the weight is lifted is gravity. The force is weight Hence F =F = weight = mass(acceleration due to gravity) = 32 pounds(9.8 m/s²) =14.51(9.8) N = 142.198
With the F= 142.2, d=10 ft = 3.04 m W=F·d = 142.2· 3.04 = 432.228 J (Joules)