3. Twins Bo and Joe have a combined mass of 200 kg and are zooming along at 10 mls in a 100 kg amusement park bumper car. They bump into Melinda's car, which is sitting still. Melinda has a mass of 25 kg and is also in a 100 kg car. After the collision, the twins continue moving with a speed of 4.12 mls. a. What is the initial momentum of the system? b. What must be the final momentum of the system? c. How fast is Melinda's car bumped across the floor? 4. Jamal is playing in the arcade at Six Flags. At one booth, he throws a 0.5 kg ball with a velocity of 21 mls and hits a 0.2 kg bottle sitting on a shelf. The bottle goes flying forward at 30 mls. a. What is the velocity of the ball after it hits the bottle? b. If the bottle was more massive but flew forward with the same final velocity, how would this affect the final velocity of the ball