דו 1. A ball is thrown horizontally from the roof of a tall building 25 in high

a) When will it strikes to the ground?

b) At what speed will it strike the ground?​

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=