Question

A body of mass $5kg$ falls from a height of $10m$ to $4m$. (Take $g=10m{s}^{-2}$). Calculate the total energy possessed by the body at any instant?

• A. $5J$
• B. $0J$
• C. $500J$
• D. $50000J$

Answer 1

The correct option is C $500J$

Potential Energy, $P.E=m\times g\times h$

In case of $10m$

$P.E=5\times 10\times 10=500J$

Energy is always conserved.Hence for $4m$ case it will have potential energy $200J$ but it will have kinetic energy of $300J$.

At any instant it will not have energy less or more than $500J$.