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A mass of 2 kg is moving at some velocity and collides inelastically with a 12...

A mass of 2 kg is moving at some velocity and collides inelastically with a 12 kg moving in the -x direction at 14 m/s. After the collision, both masses are moving in the -x direction and the total kinetic energy of both masses is 571 Joules. What is the total kinetic energy of both masses before the collision in Joules?

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