How do i solve all parts here:

Question 3 Question: Not yet Two masses mi = 1.95 kg and my = 1.58 kg move towards each other on a frictionless track. my has speed uj = 2.70 m/s to the right while my has a speed u2 = 3.14 m/s to the left (Figure 1). They collide. The answered collision lasts 0.0153 s. After the collision my moves to the right with a speed v2 = 2.94 m/s. Marked out of 1.00 Flag u1 U2 question m1 m2 Figure 1: Diagrammatic representation of two masses, mj and m2, moving towards each other on a frictionless track at speeds of uj to the right and u2 to the left, respectively. Part 1) Before the collision what is the velocity of the centre of mass of the system? Ucom = m/s to the right Note: Give a negative answer if it is to the left. Part 2) What is the final velocity of my? V1 = m/s to the right Note: Give a negative answer if it is to the left. Part 3) What is the average force on m2 during the collision? Favg = N to the right Note: Give a negative answer if it is to the left