Ball 1 with m1 = 8 kg has an initial speed in the x direction of 10 m/s and hits ball 2 with m2 = 5 kg. After the collision, ball 2 had a velocity of v2f = 5 m/s at an angle ϕ = 25 degrees. What is the final magnitude and angle of the velocity for Ball 1, i.e., what is v1f and θ?

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