A gardener pushes a lawn roller along level ground by applying a constant horizontal force of 250N. The roller moves 12m in the direction of the force.
(i) Calculate the work done by the gardener on the roller.
(ii) Express this work in kilojoules.
(iii) If the gardener wishes to perform the same amount of work by pushing with a smaller horizontal force of 150N, how far must the roller be moved? (Assume the direction of motion is unchanged.)