A4 kg block slides down a rough inclined plane inclined at 30° 179009.gif with the horizontal. determine the coefficient of kinetic friction between the block and the surface if the block has an acceleration of 1.2 m/s2.

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