A 2 kg box is sliding down a frictionless ramp as the shown in the figure below, it starts from rest and slides a distance d=5.5 m. Find its speed when it reaches the bottom of the ramp.

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

um if your asking how to beat a level then that i can with that and how to fix your wii but other than that i can't u