a cricket ball is hit so that it travels straight up in the air and it require 3 second to reach the maximum height its initial velocity is

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

The radius of an atom is closest in size to a

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge