For a freely falling object dropped from rest, what is the velocity at three seconds of fall? 45 m/s
10 m/s
30 m/s
0 m/s

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

i think the answer is a and b

i wish you luck

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