Question

A body of density $\rho$ and volume $V$ is lifted through height $h$ in a liquid of density $\sigma (<\rho )$. Then increase in gravitational potential energy of the body is:

• A. $V(\rho -\sigma )gh$
• B. $V\rho gh$
• C. $V\sigma gh$
• D. Zero

Answer 1

The correct option is B $V\rho gh$

Increase in gravitational potential energy is $mgh=\left(\rho V\right)gh$