A 100 kg football linebacker moving at 2 m/s tackles head-onan 80 kg halfback ru

Question

A 100 kg football linebacker moving at 2 m/s tackles head-onan 80 kg halfback running 3 m/s. Assume the two players wereinitially running directly at one another. Neglecting theeffects due to digging in of cleats: a. This is a simple example of an elastic collision. b. The halfback will drive the linebacker backward. c. The linebacker will drive the halfback backward. d. Neither player will drive the other backward. A 100 kg football linebacker moving at 2 m/s tackles head-onan 80 kg halfback running 3 m/s. Assume the two players wereinitially running directly at one another. Neglecting theeffects due to digging in of cleats: a. This is a simple example of an elastic collision. b. The halfback will drive the linebacker backward. c. The linebacker will drive the halfback backward. d. Neither player will drive the other backward.

Explanation / Answer

We cannot say for sure which type of collision this is going to endup being... Calculate their momentum 100*2 = 200 80*3 = 240 Now check the momentum of the players as a system m1v1 + m2v2 = (m1+m2)v3 v3 = 440/(180) = 2.44 m/s I do declare that the halfback is going to move that linebackerbackwards. I cannot think of any reason why this would be elasticin any practical application... they are not going to bounce off ofeach other and go flying in another direction. i would put b

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