Answer the following question(s) on a separate sheet of paper and upload a scan or image of it as a .doc or .pdf file to the appropriate Canvas assignment. 1. A car is moving at a constant speed of 25m/s towards a stationary observer. The car's horn emits a sound wave at a frequency of 500 Hz. The speed of sound in the air is 340m/s. a. Calculate the frequency heard by the observer when the car is approaching. b. If the car moves away from the observer after passing by, what frequency will be heard then? c. If the observer stands still and another car, traveling at 20m/s, approaches emitting a sound wave with a frequency of 600Hz, what will be the frequency heard by the observer?