Answer:
As the sound approaches, it gets louder (simply because you're closer to the source), and has a higher pitch. Then, as it passes, the sound suddenly dips down, and as it drives away you hear a lower pitch, plus a decreasing volume as the engine gets farther and farther away.
Explanation:
Do you have a picture of the diagram that I could view?
Hello!
Let's put it into symbols:
Change in velocity =

A measurable interval:

This division is:

We can recognize this as the
Average Acceleration
The pulleys will reduce the mechanical force (effort) required to lift the block and will change the mechanical advantage.
The pulley system is a type of simple machine which makes our work easier and faster by overcoming a large load when a small force (effort) is applied to it.
The efficiency of a machine is calculated as follows;

where;
- <em>M.A is the mechanical advantage </em>
- <em>V.R is the velocity ratio</em>

The velocity ratio of a pulley system = number of pulleys
The velocity ratio of a pulley system increases with increase in the number of pulleys.
Thus, we can conclude that the pulleys will reduce the mechanical force (effort) required to lift the block and will change the mechanical advantage.
Learn more about velocity ratio of pulleys here: brainly.com/question/24785465