A 20-kg projectile is passing through the origin O with a velocity v0 = (60 m/s)i when it explodes into two fragments A and B, of 8-kg and 12-kg, respectively. Knowing that 2 s later the position of fragment A is (120 m,−10 m,−20m), determine the position of fragment B at the same instant. Assume ay = −g= −9.81 m/s2 and neglect air resistance.