A passenger elevator travels from the first floor to the 60th floor, at a distance of 210 meters in 35 seconds. What is the elevators speed?

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?

How do cracks affect the rate of weathering?