As shown in the figure below, Felipe walks from the house to his truck on the way to work. He walks 20m to the truck and drives another 60m in his truck for a total time of 20 seconds What is Felipe’s average velocity over the entire 20 seconds period?. (Answer using a coordinate system where rightward is positive.)

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=