A skateboarder is jumping down a set of stairs. Assume the stairs are above the ground by h = 3.94 m, and are l = 3.15 m long. The skateboarder is heading toward the top of the stairs with a speed of 9.15 m/s, and they simply roll off the top - no jumping in the air. How far from the bottom of the stairs will they land?

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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

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation