5. For the following questions, assume the potential energy of the mass was 0.20 J when released at
point E.
a) If the mass-cord system loses 0.20 J of potential
energy as it travels to point C, what velocity would it
gain as it is accelerated to point C?

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

could you add the photo?

explanation: