After shooting a cannonball, a cannon recoils with a much lower velocity than the cannonball. This is primarily because The cannonball has more applied force than the cannon

The cannonball has more energy than the cannon

The cannon has much greater mass than the cannonball

the cannon has much greater mass than the cannonball

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