- The speed of a small jet aircraft was measured every 5 seconds, starting from the time it turned onto a runway, until the time when it left the ground.
The results are given in the table below with the time in seconds and the speed in \(\mathrm { ms } ^ { - 1 }\).
| Time \(( \mathrm { s } )\) | 0 | 5 | 10 | 15 | 20 | 25 |
| Speed \(\left( \mathrm { m } \mathrm { s } ^ { - 1 } \right)\) | 2 | 5 | 10 | 18 | 28 | 42 |
Using all of this information,
- estimate the length of runway used by the jet to take off.
Given that the jet accelerated smoothly in these 25 seconds,
- explain whether your answer to part (a) is an underestimate or an overestimate of the length of runway used by the jet to take off.