Speedy sue, driving at 33.0 m/s, enters a one-lane tunnel. she then observes a slow-moving van 160 m ahead traveling at 5.20 m/s. sue applies her brakes but can accelerate only at −1.50 m/s^2 because the road is wet. will there be a collision? yes no. if yes, determine how far into the tunnel and at what time the collision occurs. if no, determine the distance of closest approach between sue's car and the van. (if no, enter "0" for the time.)

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=