If a stone and a pencil are dropped simultaneously in vacuum from the top of a tower. which of the two will reach the ground first and why?

Since there is no air redistribute in a vacuum they both will reach the ground at the same time when released from the same height.

Gravity pulls both of them down , but since there is no buoyancy and air resistance, they will reach at the same time.

But if it was not a vacuum the the the two would reach at separate timing(stone first , then pencil).

a person with a mass of 106kg has a weight of 1060n

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