Amotorcycle officer hidden at an intersection observes a car driven by an oblivious driver who ignores a stop sign and continues through the intersection at constant speed. the police officer takes off in pursuit 1.73 s after the car has passed the stop sign. she accelerates at 4.6 m/s2 until her speed is 106 km/h, and then continues at this speed until she catches the car. at that instant, the car is 1.8 km from the intersection.