physics ( please help me)

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Ice hockey star Wayne gretzky is skatin at 13.0 m/s^1 towards a defender, who is in turn skating at 5.0 m/s^-1 toward gretzky.gretzky's weight is 756 N, that of the defender is 900 N. Immediately after the collision. gretzky is moving at 3.00 m/s^-1 in his original direction. Neglect exernal horizonal forces applied by the ice to the skaters during the collision.
A) What is the velocity of the defender immediately after the collision?
B) Calculate the change in total kinetic energy of the two players?

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