Problem: An unstable atomic nucleus of mass 1.60 10-26 kg initially at rest disintegrates into three particles. One of the particles, of mass 5.08 10-27 kg, moves along the y axis with a speed of 6.00 106 m/s. Another particle, of mass 8.50 10-27 kg, moves along the x axis with a speed of 4.00 106 m/s. A) Find the velocity of the third particle. (-1.40e7 i - 1.26e7 j) B) Find the total kinetic energy increase in the process. I have been messing around with the numbers and can not figure out how to determine the increase in kinetic energy. I have one more attempt and then I get it wrong. Any and all help is greatly appreciated!