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9. Two blocks moving in opposite directions collide and stick together after the collision. What is their combined speed after the collision? 8 1gc ikg 2kg After 10. An explosion causes the cars to move apart from each other. According to the diagram below, what is the speed of each of the cars as they move away from each other? Before explosion FIR P total-a p to the left-20 After explosion p to the right-20 p total-0 11. A 3000-kg truck moving rightward with a speed of 5 km/hr collides head-on with a 1000-kg car moving leftward with a speed of 10 km/hr. The two vehicles stick together and move with the same velocity after the collision. Determine the post-collision speed of the car and truck. Mon 12. During a goal-line stand, a 75-kg fullback moving eastward with a speed of 10 m/s collides head-on with a 100-kg lineman moving westward with a speed of 4 m/s. The two players collide and stick together, moving at the same velocity after the collision. Determine the the post- collision velocity of the two players. 13. Calculate the velocity of the rifles recoil after firing. M-4 kg m 0.010 kg V=300 my's v=7 14. What is the velocity of the "8" ball after the elastic collision below? Before v 20 m/s m-0.25 kg v=0 m/s 0.25 kg Ater v=7 m/s 15. A 6000 kg railroad car moving at 5 m/s collides into a stationary car with a mass of 4000 kg. If they couple together after the collision, what will be their combined velocity immediately after impact? SP v = ? m/s