General physics

7) The mass of a curling stone is approximately 19 kg. If a curler releases the stone just before the "hog line" with a velocity of 5 m/s and collides head-on with an opponent's guard stone at rest. After the collision the guard stone is set in motion and moves with a velocity of 3.5 m/s. What is the velocity of the thrown stone that after the collision? What type collision is this? (3) Bonus: Derive the impulse-momentum theorem from Newton's Second Law of Motion. (2)