3. Suppose that a car traveling to the west (-x direction) slows down uniformly as it ap- proaches a traffic light. Which statement concerning its acceleration must be correct? (a) Its acceleration is positive. (c) Its acceleration is zero. (b) Its acceleration is negative. (d) Its acceleration is decreasing.

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=