An inspection pod moves along a straight tunnel. The direction into the tunnel is positive.
The table gives velocity–time data for the pod. Between each pair of listed times, the velocity changes uniformly.
| time in s\mathrm{s}s | velocity in m/s\mathrm{m/s}m/s |
|---|---|
| 0.0 | +2.0 |
| 3.0 | +8.0 |
| 7.0 | +8.0 |
| 10.0 | 0.0 |
| 12.0 | -4.0 |
After 12.0 s, the pod continues at a constant velocity of -4.0 m/s until the journey ends.
The total distance travelled during the journey is 70.0 m.
Calculate the total time taken for the journey.
Calculate the displacement of the pod from its starting point at the end of the journey.