1.1. The principle of conservation of momentum applies when two objects collide. 

State the principle of conservation of momentum.

1.2. A student is investigating conservation of momentum using an air track and two gliders, A and B, which both have magnets attached, as shown in the diagram.

Initially, glider A has a momentum of 0.50 kg m/s and moves towards glider B, which is at rest. The gliders collide and the magnets cause them to move in opposite directions.

Both gliders are identical and each has a mass of 0.250 kg. 

(i) State and explain whether the poles of the magnets are opposite or alike.

(ii) State the total momentum of glider A and glider B after the collision.

(iii) Calculate the velocity of glider A before the collision.

velocity of glider A = ............................................... m/s

1.3. What is the velocity of glider B after the collision?