During a match of tennis, a 0.0585-kg tennis ball travelling at 19.4 m/s [W] is struck horizontally. The paddle exerts eastward force of 24N [E] over a time of 0.15s Determine the velocity of the ball after the collision

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=