The entries in this operational log for a harbour patrol launch are in time order.
| Log entry | Record |
|---|---|
| A | The launch travels 1.20 km at an average speed of 8.0 m/s. |
| Inspection | The launch remains stationary for 4.5 minutes. |
| B | The launch travels 630 m at an average speed of 4.5 m/s. |
What is the average speed of the launch for the period covered by the log?
4.2 m/s4.2\ \mathrm{m/s}4.2 m/s
3.3 m/s3.3\ \mathrm{m/s}3.3 m/s
1.8 m/s1.8\ \mathrm{m/s}1.8 m/s
2.5 m/s2.5\ \mathrm{m/s}2.5 m/s
96 exam-style questions on Edexcel GCSE Physics 2.2 Speed, velocity and acceleration, covering 2.2.1 Speed and distance–time graphs, 2.2.2 Acceleration and the uniform-acceleration equation, 2.2.3 Velocity–time graphs, and 2.2.4 Measuring speed, typical speeds and free-fall acceleration. Each one has a worked solution and a mark scheme showing where the marks go.