Nathan walks to the store. He walks 850 meters north then relazies he walked to far he turns around and walks 500 meters south. the entire walk takes him 20 seconds, what was his velocity in meters per second?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=