In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm. what force must be applied on the small piston in order to lift a car weighing 20,000 n on the large piston?

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

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