1. The problem statement, all variables and given/known data An object explodes into three equal masses. One mass moves east with a velocity of 15.0m/s. A second mass moves at a velocity of 10.0m/s at 40 degrees south of east. What is the velocity of the third mass? I desperately need help, i forgot my notes at school over the weekend, and this is material from the beginning of the year and I am confused as to where to start. Any help/ suggestions with where to start would really be appreciated as this is diploma exam prep.