Physics · WORK, ENERGY AND POWER

A body of mass \( m \) moving with an initial velocity \( v_1 \) undergoes a head-on one-dimensional elastic collision with an identical body of mass \( m \) initially at rest. The velocities of the first and second body after collision are respectively:

1. A
   \( v_1 \) and \( 0 \)
2. B
   \( 0 \) and \( v_1 \)
3. C
   \( \frac{v_1}{2} \) and \( \frac{v_1}{2} \)
4. D
   \( -v_1 \) and \( v_1 \)