Two football players are running toward each other. one football player has a mass of 105 kg and is running at 8.6 m/s. the other player has a mass of 90 kg and is running at –9.0 m/s.
the momentum of the system after the football players collide is kg • m/s.

Explanation:

The momentum is an amount that is preserved as long as there is no external force, as in this case. Therefore the momentum of the system after the crash will be the sum of the momenta before the crash.

The momentum is given by the following expression:

Where p is the momentum, m the mass and v the speed. In this case we have:

b.

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