Assume that a police vehicle on the highway is moving to the right at 27 m/s, while a speeder is coming up from almost directly behind at a speed of 39 m/s, both speeds being with respect to the ground. The police officer aims a radar gun at the speeder. Suppose that the electromagnetic wave emitted by the radar gun has a frequency of 6.00 x 109 Hz. Obtain the the difference between the frequency of the wave that returns to the police vehicle after reflecting from the speeder's car? Determine the original frequency emitted by the police vehicle?