1) A 2.0 kg object moving at 5.0 m s⁻¹ to the right collides with a stationary 3.0 kg object.

After the collision, the 2.0 kg object travels at 1.0 m s⁻¹ to the left and the 3.0 kg object travels at 4.0 m s⁻¹ to the right.

Which statement describes the collision?

2) Two equal masses travel towards each other on a frictionless air track at speeds of 60 cm s^–1 and 30 cm s^–1. They stick together on impact.

What is the speed of the masses after impact?

3) Water of density 1000 kg m³ leaves a circular nozzle of diameter 8.0 mm at a speed of 12 m s⁻¹.

The water strikes a wall normally and rebounds directly backwards at the same speed.

What is the force exerted by the water on the wall?

4) An object of mass 1.5 kg is sliding with a velocity of 3.0 m s⁻¹ on a frictionless surface towards another object which is stationary and has a mass of 2.0 kg. This head-on collision is completely inelastic (the two objects are stuck together). If the duration of the collision is 0.050 s, the average force that is exerted between the objects during the collision is

5) Which quantities are conserved in an inelastic collision?