3. An 11kg ball moving at 33m/s strikes a second ball at rest. After the collision the 11kg ball is moving with a velocity of 13m/s and the second ball is moving with velocity of 8m/s. What is the mass of the second ball? 4. A 0.5kg ball strikes a second 1.5kg ball at rest. After the collision the 0.5kg ball moving with a velocity of 13m/s and the second ball is moving with a velocity What is the initial velocity of the first ball? of 8m/s. CLOSE​