A truck pulls a loaded trailer along a horizontal road.
The truck pulls the trailer with a constant force of 240 N240\text{ N}240 N for a distance of 150 m150\text{ m}150 m.
(i) State the equation linking work done, force, and distance.
(ii) Calculate the work done by the truck on the trailer.
(iii) State how much energy is transferred to the trailer.
The mass of the truck is 2200 kg2200\text{ kg}2200 kg. The mass of the trailer is 800 kg800\text{ kg}800 kg.
(i) State the equation linking kinetic energy, mass, and velocity.
(ii) Calculate the total kinetic energy when the truck and trailer travel together at a constant speed of 18 m/s18\text{ m/s}18 m/s.
The trailer is disconnected, and the truck makes the return journey without it. Without the trailer, the truck has greater acceleration and uses less fuel. Explain these changes.
