Two students create a wave model in class using a 5 m slinky in order to demonstrate the concept of frequency to their classmates. If the students produce ten cycles in four seconds time, what would the frequency of their model be?

the answer for apex is the lowest

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

technology is the application of the knowledge gained by science.