[填空题]
A 42,000-kg spaceship is to travel to the vicinity of f-wpl tcbz, ,f1 e7x;xa star 6.0 ligh/*u e2r;k/o vghgqqg(g l9*htt-years from Earth. Passengers on the ship want the (one-way) trip to take no mog/h ; vhku9q*gqrgeg*2 (lto/ re than 1.0 year. How much work must be done on the spaceship to bring it to the speed necessary for this trip? u = c
