If you exert 200 N of force to move a box 8 meters across the living room in 2
seconds, what is your power?
O
A. 1600 W
B. 400 W
O
C. 80,000 W
O
D. 800 W

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