The enzyme is found in bacterial plasma membrane, in thylakoid membrane (chloroplast ATP synthase) and in inner mitochondrial membrane. The main function of the enzyme is ATP production.
In this case, the terminal velocity increases to about 320 km/h (200 mph or 90 m/s), which is almost the terminal velocity of the peregrine falcon diving down on its prey.
That depends. When you fall, you may or may not have a starting velocity and every second you fall, your falling speed will increase by 9,8 m/s (until you reach terminal velocity). In other words, how long it takes, depends on how long you've been falling before you start measuring for the mile.