A copper sphere weighs $\mathrm{M}_{1} \mathrm{~N}$ in air and $\mathrm{M}_{2} \mathrm{~N}$ in water

Question

A copper sphere weighs $\mathrm{M}_{1} \mathrm{~N}$ in air and $\mathrm{M}_{2} \mathrm{~N}$ in water when immersed. The work done on the sphere (in joules) to push it in water through $\mathrm{M}_{3}$ (meters) will be given by\

Professor PC Thomas Classes · Answer

Work done $=\left(\mathrm{M}_{1}-\mathrm{M}_{2}\right) \mathrm{M}_{3}$