The table shows how the velocity of a car changes during a short journey.
Table
| Time (s) | Velocity (m/s) |
|---|---|
| 0 | 0 |
| 5 | 10 |
| 10 | 20 |
| 15 | 20 |
| 20 | 0 |
The velocity changes at a steady rate between each pair of readings.
What is the deceleration of the car between 15 s and 20 s?
0.25 m/s20.25\ \text{m/s}^20.25 m/s2
1.0 m/s21.0\ \text{m/s}^21.0 m/s2
4.0 m/s24.0\ \text{m/s}^24.0 m/s2
100 m/s2100\ \text{m/s}^2100 m/s2
43 exam-style questions on OCR GCSE Physics 2.1 Motion, covering 2.1.1 Measuring distance and time, 2.1.2 Measuring speed, 2.1.3 Ratios, units and rates in motion, 2.1.4 Scalars and vectors in motion, 2.1.5 Distance-time and velocity-time graphs, 2.1.6 Area under a velocity-time graph, 2.1.7 Average speed for non-uniform motion, and 2.1.8 Uniform motion and uniform acceleration. Each one has a worked solution and a mark scheme showing where the marks go.