A car of mass 200kg moving at a velocity of 120km/h its velocity to 60km/h in 40 second when the car hits an object 1. Calculate the momentum before hitting the object.
2. Calculate its momentum after hitting the object.
3. Calculate the change in momentum.
4. Calculate the resultant force once the car hit the object

the answer would be   dignified - apex

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