Jenny got a balloon at a party. when she squeezes the balloon, she can squish the air inside it and change the shape of the balloon. which of the following is/are true about the change that happens when jenny squishes the balloon? i. it is a physical change. ii. it makes a new substance. iii. it is a chemical change.

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