A stationary partical explodes into two partical of a masses `m_(1) and m_(2)` which move in opposite direction with velocities `v_(1) and v_(2)`. The ratio of their kinetic energies `E_(1)//E_(2)` is
A. `m_(1)//m_(2)`
B. `1`
C. `m_(1)v_(2)//m_(2)v_(1)`
D. `m_(2)//m_(1)`
