A small asteroid with a mass of 2.05 x 10 kg is pulled into a circular orbit around Earth. The distance from the asteroid to Earth's center is 7378 km. If the gravitational force needed to keep the asteroid in orbit has a magnitude of 3 x 10° N, what is the asteroid's tangential speed?

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

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