Make use of appropriate graphics (graphs, photographs, sketches) to support your discussion

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

i don't know that i agree with that but what's the question ?

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