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2) Mass 1 is moving at 7 m/s in the +x direction and it collides in...

2) Mass 1 is moving at 7 m/s in the +x direction and it collides in a perfectly elastically with mass 2 of 3 kg moving at 14 in the -x direction. They collide for 0.2 seconds, and the average force on mass 1 is 150 N in the -x direction. What is the mass of mass 1 in kg?

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Conserve linear momentum.

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