A spaceship of mass 2.00×10^6kg is cruising at a speed of 5.60×10^6m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.80×10^5kg , is blown straight backward with a speed of 2.30×10^6m/s. A second piece, with mass 7.60×10^5 kg, continues forward at 1.00×106. What is the speed of the third piece?