A rock is dropped ( from rest) off a bulding of unknown height. it takes 3.2s to hit the ground. what is the rock's velocity (magnitude and direction) just before it hits the ground? note: gravity is 9.8 meters per seconds squared

so easy. just google the electromagnetic waves and it’ll pop up.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

technology is the application of the knowledge gained by science.

answer( sicar );