A car accelerates from rest to 90km/hr in 10 seconds. what is its acceleration in m/s2​

Explanation:

v = 90km/h = 90000m/h = 1500m/min = 25m/s

a = v/t

a = 25m/s / 10s =

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