A 70 kg running back runs towards the endzone at 3.0 m/s. A 75 kg linebacker at him with a velocity of 2.8 m/s. They collide. Will the running back score?

answer: what are you talking about?

explanation:

the rearrangement of particles in a physical change. hope this

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