\( \Rightarrow \,\,W\, = \,\,2000\,\, \times \,\,9.8\,\, \times \,\,25\,\, + \,\,\frac{1}{2}\,\, \times \,\,2000\,\, \times \,\,{3^2}\, + \,\,500\,\, \times \,\,25\)
\( = \,\,\,490000\,\, + \,\,9000\,\,\, + \,\,12500\,\, = \,\,511500\,J\,\, = \,\,511.5\,\,kJ\)