A 90 kg linebacker running downfield at 10 ms collides with, Physics

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A 90 kg linebacker running downfield at 10 ms collides with

A 90 kg linebacker running downfield at 10 m/s collides with a 65 kg referee who is at rest.

a) What is their final momentum?

b) What is the final velocity of the linebacker-referee system?

c) What is the initial kinetic energy of the linebacker?

d) What is the initial kinetic energy of the referee?

e) Is kinetic energy conserved? f) Is momentum conserved?

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