Final answer:
The question involves applying the conservation of momentum principle to determine the final speed of two colliding hockey players who stick together post-collision. Due to missing details, a specific answer cannot be provided but the formula for conservation of momentum in two dimensions would be required.
Step-by-step explanation:
The question refers to a scenario where two hockey players, each with a mass of 78.5 kg and skating at a speed of 6.22 m/s, collide at an angle of 125 degrees and stick together. To solve for their speed after the collision, we would need to apply the principle of conservation of momentum in two dimensions since the collision is not head-on. The final speed can be determined using the formula for the conservation of momentum in the x and y directions separately and then combining the two to get the resultant speed.
However, as the question seems to be missing some details, we're unable to provide a specific numerical answer. With the provided mass and speed, as well as the angle, one would typically use the formula m1 * v1 + m2 * v2 = (m1 + m2) * v_final, where m1 and m2 are the masses, v1 and v2 are the velocities before collision, and v_final is the final velocity of the combined mass after collision.
If we had more clear details of the question, we could provide a step-by-step calculation to determine the speed after the collision.