A firework at rest bursts into three fragments. The masses and velocities of the three fragments immediately after the explosion are shown. What are speed $v_1$ and speed $v_2$?
- A$v_1 = 4.0\,\text{m s}^{-1}$, $v_2 = 4.0\,\text{m s}^{-1}$
- B$v_1 = 9.2\,\text{m s}^{-1}$, $v_2 = 9.2\,\text{m s}^{-1}$
- C$v_1 = 14\,\text{m s}^{-1}$, $v_2 = 14\,\text{m s}^{-1}$
- D$v_1 = 16\,\text{m s}^{-1}$, $v_2 = 16\,\text{m s}^{-1}$