A 14000 N car driving at 25 m/s slams on its brakes. The coefficient of kinetic friction between the tires and the road is 0.7. What is the force of friction between the car and the road?

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=