Question

A vessel containing $50kg$ of water of height $15m$ is placed above the ground. Assuming the gravitational potential energy at ground to be zero. What will be the gravitational potential energy of water in the vessel ? $(g=10m{s}^{-2})$

• A. $0J$
• B. $750J$
• C. $3750J$
• D. $7500J$

Answer 1

Answer: (C)

$3750J$

Gravitational potential energy $U=mgh$

Center of mass of water is at $h=15/2m$

So $U=mgh=50\times 10\times 15/2=3750J$