1) A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Assume the two players were initially running directly at one another. Neglecting the effects due to digging in of cleats.
1. This is an example of an elastic collision.
2. The halfback will drive the linebacker backward.
3. The linebacker will drive the halfback backward.
4. Neither player will drive the other backward.
2) The moon pulls on the earth with one-sixth the force that the earth exerts on the moon. True or False