3. Compute the force of a small car, weighing 2,205 pounds, traveling 60 mph, that crashes into a steel pole and comes to a stop in 0.05 second. (For this to work, the computations must be all metric!) Then, you need to find acceleration, or actually car's deceleration i. e., the difference between its final speed and initial speed, at the moment of impact. (Once mass and acceleration are known, one can compute force in newtons. Show set-up. )

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=