A helicopter at a height of 500m drops a package which falls to the ground in a time of 10s. Neglecting air resistance and assuming the acceleration is constant and equal to 10m/s

the answer is mosques. they are an important part of islamic culture.

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