A ranger in a national park is driving at 21.8 mi/h when a deer jumps into the road
229 ft ahead of the vehicle. After a reaction time of t the ranger applies the brakes to
produce and acceleration of −8.84 ft/s
2
.
What is the maximum reaction time allowed if she is to avoid hitting the deer?
Answer in units of s.

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=