A 100 kg football linebacker is moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. suppose the two players were initially running directly at one another. Neglecting the effects due to digging in of cleats:
1. The halfback will drive the linebacker backward.
2. The linebacker will drive the halfback backward.
3. This is a simple example of an elastic collision.
4. Neither player will drive the other backward.