1) The diagram shows a cannon ball fired from cannon.

The mass of the cannon is 1000 kg and the mass of the cannon ball is 10 kg. The recoil velocity of the cannon is 5.0 m s^–1 horizontally. What is the horizontal velocity of the cannon ball?

2) The diagram shows the masses and velocities of two trolleys about to collide.

After the impact they move off together. What is the total kinetic energy of the trolleys after the collision?

3) A 2.0 kg mass travelling at 3.0 m s⁻¹ on a frictionless surface collides head-on with a stationary 1.0 kg mass. The masses stick together on impact. How much energy is lost on impact?

How much energy is lost on impact?

4) 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?

5) 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