A spaceship of mass 2.0 x 10^6 kg is crusing at a speed of 5.0 x 10^6 m s when the anitmatter reactor fails, blowing the ship into three pieces. one section having a mass of 5.0 x 10^5 kg, is blown straight backwards with a speed of 2.0 x 10^6 m s. a second piece, with mass 8.0 x 10^6 kg, continues forward at 1.0 x10^6 m s. what are the direction and speed of the third piece?