The table describes four straight sections on velocity–time graphs. All velocities are in the same direction.
| Section | Initial velocity in m/s\mathrm{m/s}m/s | Final velocity in m/s\mathrm{m/s}m/s | Time taken in s\mathrm{s}s |
|---|---|---|---|
| P | 4.0 | 10 | 3.0 |
| Q | 3.0 | 15 | 8.0 |
| R | 8.0 | 20 | 4.0 |
| S | 0 | 15 | 6.0 |
Which section has the greatest positive gradient?
Section P
Section Q
Section S
Section R