Question
A $\pi^+$ and a $\pi^-$ are moving toward each other extremely slowly. When they collide, two $\pi^0$ are produced. How fast are they going? (Ignore relativistic effects.)
1. Barley moving
2. $1.0\times 10^{7}\textrm{ m/s}$
3. $2.0\times 10^{7}\textrm{ m/s}$
4. $7.8 \times 10^{7} \textrm{ m/s}$
5. $5.5 \times 10^{ 7} \textrm{ m/s}$
(e)
Solution Video