3. A ball (mass=0.30 Kg) is traveling to the left with a speed of 0.40 m/s and collides with another ball (mass=0.80 Kg) that is traveling to the right with a speed of 0.20 m/s. The second ball has a spring attached to it. a) What is the speed of both balls after the collision? b) What is the speed of both balls at minimum separation? c) How much energy is stored in the spring at minimum separation? d) Is the collision elastic? V2=0.2 w/S V1 = 0.4 w /s Before 14 1= 0.3Kg 142=0.8Kg Section 7-4: Conservation of Energy & Momentum in Collisions At min sep . (2) +.6054+-376 e (c) After "Does this apply an sometimes, or never?"