Given your choice for part 1, would it be possible, in principle under ideal circumstances, for a balloon to stick to a wall indefinitely

yeet youwelcome broo

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

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray