A 6.87 kg red ball initially has velocity x-component v​red,i,x​​=9.77 and a 7.67 kg green ball initially has velocity x-component v_{green,i,x}​​=2.00. The two balls collide and afterwards the red ball has velocity x-component v_{red,f,x}=1.37. If there are no external forces acting on this system of two balls, what must the final velocity x-component of the green ball be?

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