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# Relativistic Momentum

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A football player with a mass of 88 kg and a speed of 2.0 m/s collides head-on with a player from the opposing team whose mass is 120 kg. The players stick together and are at rest after the collision. Find the speed of the second player, assuming the speed of light is 3.0 m/s.

https://brainmass.com/physics/work/relativistic-momentum-41650

#### Solution Preview

This is a conservation of momentum problem in the relativistic frame P1 + P2 had to have been zero to start with for the football players to come to rest in the conservative collision. Here following the collision both the system kinetic energy and the momentum are zero.

The factor of import to ...

#### Solution Summary

This solution provides calculations and explanation for the student to understand the work. The final calculation must be done by the student on his or her own, but can be done easily from the Expert's outline. 233 words.

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