An automated vehicle uses a pulse of sound to find its distance from a wall in a tunnel.
The pulse travels through air, reflects from the wall and is detected back at the vehicle. The measured time is for the journey to the wall and back.
| Quantity | Value |
|---|---|
| Speed of sound in air | 340 m/s |
| Time between sending the pulse and detecting the echo | 0.20 s |
The distance from the vehicle to the wall can be calculated using d=vt2d=\dfrac{vt}{2}d=2vt.
Calculate how far the wall is from the vehicle.