What is the energy equivalent of an object with a mass of 2. 5 kg? 5. 5 Ă— 108 J 7. 5 Ă— 108 J 3. 6 Ă— 1016 J 2. 25 Ă— 1017 J.

he kicked it 10 feet straight up into the air? i think this works.

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