Physics · JEE | WORK, ENERGY AND POWER

In a one-dimensional elastic collision, if mass \( m_1 \) collides with stationary mass \( m_2 \), the final velocity of the first mass \( v_{1f} \) is given by:

1. A
   \( v_{1f} = \frac{2m_1}{m_1 + m_2} v_{1i} \)
2. B
   \( v_{1f} = \frac{2m_2}{m_1 + m_2} v_{1i} \)
3. C
   \( v_{1f} = \frac{m_2 - m_1}{m_1 + m_2} v_{1i} \)
4. D
   \( v_{1f} = \frac{m_1 - m_2}{m_1 + m_2} v_{1i} \)