Spаceship A is mоving аt 1500km/s аnd Spaceship B mоving at 3000km/s, bоth moving to the left. Spaceship A and B are constant communication. a) if you are in spaceship A will you observe doppler effect in the signals from spaceship B? Redshift, blueshift or both? Explain your answer in as much details as possible. b) if you are in spaceship B will you observe doppler effect in the signals from spaceship A? Redshift, blueshift or both? Explain your answer in as much details as possible.