A particle leaves the origin with its initial velocity given by v⃗ 0=14i^+16j^m/s, undergoing constant acceleration a⃗ =−1.2i^+0.36j^m/s2

answer: b.

explanation:

trig 15.3 cos

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