Question

Assuming $m\ll M$, find the fraction of the bullet's initial kinetic energy that turned into heat.

• A. $\eta =\frac{M}{m+M}$
• B. $\eta \approx 1-\frac{3m}{M}$
• C. $\eta \approx 1-\frac{2m}{M}$
• D. $\eta =\frac{m}{m+M}$

Answer 1

The correct option is A $\eta =\frac{M}{m+M}$