You throw a water balloon horizontally at 3.2m/s. You are on the roof of your house which is 6m tall. How far from your house can you hit a person?

photocells convert light energy to electricity

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