What is the difference between displacement and distance travelled

displacement is the distance moved in stated direction.

displacement is the starting point to the end point.

distance is the distance travelled in unit of time.

distance is the whole journey

here is an example:

so what is the displacement?

like I said before displacement is the starting to the end point.

so the displacement is 500km

and the distance?

distance is the whole journey

so it is 400+300=700km

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid