What happens when a wave strickes a object it can’t move through and bounces off. Does it change the frequency? And what is it called.

Answer it is called echo
EXPLINATION

Distance^2= yellow line ^2 (see picture) = 30^2 + 49^2so distance = squareroot of (300^2 +49^2)i dont know if this is how to solve it, but i cnt think of another way

Well the magnitude of its acceleration related to that car starts with the oil change like when you have to change the oil in your car you have to make sure that your precious car is starting really propley and very well