1) A toy with a mass of 2.5kg travelling at 5 m/s to the north, collides with 1 kg block which is stationary. After the collision the 2.5kg toy stops. What happens to the 1kg block?

2) A billy cart with a mass of 10kg travelling at 2.5 m/s east, collides with another 10kg billy cart travelling at 1.2 m/s in the same direction. After the collision the billy carts were stuck together and moving at the same speed. What is the velocity of the combined masses after the collision?

3) A 100g billiard ball travelling at 1.2 m/s east, collides with an identical billiard ball travelling in the same direction at 0.8 m/s. After the collision the first billiard ball rebounds in the opposite direction at 0.2 m/s. What is the velocity of the second billiard ball after the collision?

4) A dodgem-car with a mass of 65kg travelling at 4.5 m/s to the north, collides with another dodgem-car with a mass of 50kg moving in the opposite direction at 3 m/s. After the collision the 65kg dodgem-car bounces in the opposite direction at 0.5 m/s. What happens to the 50kg dodgem-car?