Answer:
The First is an example of acceleration, the second is an example of velocity
This is the Doppler effect.
1. As the sound leaves the horn the sound waves are at first close to each other and as they move outwards they become further apart. The closer the sound waves are the louder the noise.
As the car gets the closer the sound waves get closer, so the horn becomes louder.
2. As the horn moves away, the sound waves become less frequent, causing the pitch to get lower.
Answer:
Because winding roads have a gentle slope on hills, so it's easy to climb it than a steepy.