[填空题]
A spaceship and its ocd/ 7hlm g;fbn(cupants have a total mass ofnnztuy*fvp- 10xbq pd9w* -; h 150,000 kg. The occupants would like to travel to a star that is 25 light-years away at a speed of 0.60c. T h -w9*-xqbuvp *y1nz;dpft0n o accelerate, the engine of the spaceship changes mass directly to energy. How much mass will be converted to energy to accelerate the spaceship to this speed? kg
Assume the acceleration is rapid, so the speed for the entire trip can be taken to be 0.60c, and ignore decrease in total mass for the calculation. How long will the trip take according to the astronauts on board?$\Delta t_0$ = y
