A rock is thrown off a 70 m high cliff with an initial speed of 5 m/s. How far from the base of the cliff will the rock hit the water? (5 points)
A. - 25.4 m
B. - 18.5 m
C. - 7.9 m
D. -13.8 m

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

the answer should be in the picture.

it would stay the same