A 75g ping pong ball is raised up to a height of 350cm. Ignoring air resistance, if the ping pong ball is released at that height, at what speed will it hit the ground?

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

i think its d if wrong im sorry