4. Inside a spaceship flying past the earth at four-fths the speed of light. a pendulum is swinging. lo] If each swing takes 2.50 s as measured by an astronaut performing an experiment inside the spaceship, how long will the swing take as measured by" a person at mission control on earth who is watching the experiment? [b] If each swing takes 2.50 s as measured by a person at mission control on earth, how long will it take as measured by the astronaut in the spaceship