A power of 0.5W is developed when a body of mass 200g is raised to the top of a wall in 20s. Find the height of the well.
\(5.0×10^{-2} m\)
\(5.0×10^{0} m\)
\( 5.0×10^{-3} m\)
\(5.0×10^{-1} m\)