A powered trolley moves theatre scenery along a straight track in two stages. Its input power is constant at 2.0 kW throughout the journey. In each stage, the constant driving force acts in the direction of motion.
| Stage | Driving force in N\mathrm{N}N | Distance moved in m\mathrm{m}m | Time taken in s\mathrm{s}s |
|---|---|---|---|
| 1 | 700 | 15 | 8.0 |
| 2 | 500 | 25 | 12.0 |
Calculate the mean power dissipated by the trolley during the complete journey.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.