Question

An object of $5kg$ mass falls from a height of $30m$. If the whole amount of mechanical energy is converted into heat, the heat energy generated in calories is

[Assume $g=10m/s^2$]

• A. $150$
• B. $40$
• C. $358$
• D. $600$

Answer 1

The correct option is C $358$

Given, $m=5kg$ , $h=30m$, $g=10m{s}^{-2}$

Mechanical energy=$mgh=1500J$

Heat energy=$1500J=358.35cal$