An automated electric test pod is travelling on a straight track with an initial speed of 45 m s-1. The table shows the distance data for its stop:
| Phase | Distance / m\text{m}m |
|---|---|
| Reaction distance | 18 |
| Braking distance | 135 |
| Stopping distance | 153 |
The pod decelerates at a constant rate once the mechanical brakes are applied.
What is the magnitude of the deceleration of the pod during braking?
6.6 m s−26.6\text{ m s}^{-2}6.6 m s−2
7.5 m s−27.5\text{ m s}^{-2}7.5 m s−2
15 m s−215\text{ m s}^{-2}15 m s−2
56 m s−256\text{ m s}^{-2}56 m s−2
