A spy runs from the front to the back of an aircraft carrier at a velocity of 3.5 m/s. If the aircraft carrier is moving forward at 18.0 m/s, how fast does the spy appear to be running when viewed by an observer on a nearby stationary submarine?

Answer 1

The spy appears to be running at a velocity of 21.5 m/s when viewed by an observer on a nearby stationary submarine.