A fighter jet lands on the deck of an aircraft carrier. It touches down with an initial velocity of 70.4 m/s and comes to a complete stop over a distance of 197.4 m. What is the acceleration needed to completely stop this jet? How much time it would take the jet to stop?

They experience weightlessness not because of a lack of gravity but because the ISS, and they, are orbiting Earth in constant free fall. They’re falling toward Earth and moving forward at about the same velocity. Because the downward and forward forces are nearly equal, the astronauts are not pulled in any specific direction, so they float.