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 find out whether `m_(1)ltm _(2)` or `m_(1)gtm_(2)`.

Explanation

Since `m_(2)` is at rest `(u_(2)=0)`, velocity of `m_(1)` after collision:
`v_(1)=((m_(1)-em_(2))/(m_(1)+m_(2)))u_(1)`
Given `v_(1)lt0impliesm_(1)-em_(2)lt0`
`impliesm_(1)ltem_(2)impliesm_(1)ltm_(2)`