A powered actuator slides a train door along a straight, horizontal track. The actuator exerts a constant force in the direction in which the door moves.
At the start of the movement, the front edge of the door is 0.18 m from one end of the track. The door slides away from this end. When it stops, its front edge is 1.08 m from the same end of the track.
The actuator does 135 J of work during this movement.
Calculate the force exerted by the actuator.
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.