Ball 1 with mass m1 = 2.76 kg is initially travelling to the right with a speed u\" = 10.2 m/s. It collides with a second ball, ball 2, with mass m2 = 1.43 kg initially travelling to the left at a speed \"2i = 1.87 m/s (the negative sign is included to show this is to the left). Immediately after the collision, both balls move to the right; the speed of ball 1 is 01/ = 2.10 m/S. U1i Uzi V1f V2f @@ @@ Figure 'l. Momentum of two balls before and after collision. Part 1) What is the final speed of ball 2 immediately after the collision? 112 f = m/s Part 2) What is the change in kinetic energy of ball '1 during the collision? Give a positive answer if the final kinetic energy is greater than the initial kinetic energy. Part 3) Which of the following statements are true? C The net external force on the system during the collision is zero. Only conservative forces act during this collision. C C This is an inelastic collision. C This is an elastic collision