A bullet is fired into the air at an angle of 30° to the horizontal. At the same time and from the same height, a bullet is dropped. If we neglect the effects of air resistance, how will the time the two bullets spend in the

air compare?

a.   mass number from atomic number

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