3. A 3.2 kg cannon ball is fired from a 340 kg cannon. The cannon recoils with a velocity of 6.1 m/s. What is the velocity of the cannon ball when it leaves the cannon? 4. A 51 kg surfer jumps off the back of a 19 kg surfboard that is moving forward with a velocity of 2.3 m/s. After the surfer leaves the surfboard, it moves forward with a velocity of 9.5 m/s. With what velocity, relative to the water, did the surfer leave? 5. A 0.12 kg baseball reaches a batter with a speed of 40 m/s, and is struck by his bat. The 1.21 kg bat has an initial speed of 30 m/s, and slows to 12 m/s after the collision. If an elastic collision is assumed, what is the magnitude of the velocity of the baseball after the collision? 6. A 4.5 kg cart (cart 1) rolling at 6.0 m/s strikes another 4.5 kg cart (car 2) initially at rest. If the collision is elastic, what is the velocity of the first and second cart after the collision? 7. Object A of mass 27 kg travels to the east at 5.1 m/s and object B of mass 13 kg travels to the south at 2.6 m/s. They collide and stick together in a perfect inelastic collision as shown below. What is the magnitude and direction (with respect to the horizontal) of the velocity of the two objects after the collision? 8. Object A of mass 5 kg travels to the east at 30.3 m/s and object B of mass 54 kg travels to the south at 2.9 m/s. They collide and stick together in a perfect inelastic collision as shown below. What is the magnitude and direction (with respect to the horizontal) of the velocity of the two objects after the collision