A mass of 4 kg is moving in the +x direction and collides inelastically with another mass of 8 kg moving at 4 m/s in the -x direction. The collision…

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A mass of 4 kg is moving in the +x direction and collides inelastically with another mass of 8 kg moving at 4 m/s in the -x direction. The collision takes place in 0.37 seconds and the average force on the second mass is 150 Newtons in the +x direction. What is the kinetic energy of the 4 kg mass before the collision?

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