The brakes on your automobile are capable of slowing down your car at a rate of 4.7 m/s2. (a) If you are going 134 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 90 km/h speed limit

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.