A mass `m_(1)` moves with a great velocity. It strikes another mass `m_(2)` at rest in head-on collision. It comes back along its path with low speed after collision. Then
A. `m_(1)gtm_(2)`
B. `m_(1)ltm_(2)`
C. `m_(1)=m_(2)`
D. There is no relation between `m_(1)` and `m_(2)`
