Study the position-time graph for a bicycle.

which statement is supported by the graph?

a) the bicycle has speed but not velocity.
b) the bicycle is moving at a constant velocity.
c) the bicycle has a displacement of 3 m.
d) the bicycle is not in motion.

a is the best answer your welcome

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