4. Do you think you can compress water just like you compressed the air? Try it. Describe the difference you notice between using air in the syringe, and water in the syringe.

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

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000