Question

A bullet of mass $10$ g is moving with speed $400$ m/s. Find the kinetic energy in calories?

Answer 1

Kinetic energy of bullet $=\frac{1}{2}m{v}^2=\frac{1}{2}\frac{10}{1000}(400{)}^2$ $=800J$

Now we will convert $800J$ in calorie $\frac{800}{4.18}=191.38756$ calorie