A 5000ton freight is moving at a speed of 10mph, next to it a 3250lb Ferrari is moving at a speed of 250mph. Both hit the breaks, but who stops first?​

The truck because it has more weight to slow it down also it's only going 10mph

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