1. The problem statement, all variables and given/known data An interstlear ship has a mass of 8.97 kg x10^6 and is initially at rest to a star system. What constant acceleration is needed to bring the ship up to a speed of 0.51C, relative to the star system in three days. 2. Relevant equations constant acceleration = v2-v1/t2-t1 3. The attempt at a solution a=1.5x10^7/1.3 x 10^5 a=120 m/s^2 ??? Help!!