[填空题]
A spaceship and its occupan5h7quq0 op4.ij yyb/mts have a total mass of 150,000 kg.s7 pd1vx;na1 lt;4g( we n+czb The occupants would like to travel to a star that is 25 bv;anl+t(7 es1dp z x 1wg;c4nlight-years away at a speed of 0.60c. To 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
