A30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. the mission lasts exactly 20 years as measured on earth. biologically speaking, at the end of the mission, the astronaut's age would be

The distance a car travels between the time the driver decides to stop the car and the time the driver puts on brakes is called the reaction distance. how does the reaction distance change with speed? a.reaction distance decreases with with speed b.reaction distance stays the same with speed c.reaction distance increases with speed. d.there is not enough information to answer the question