1. A 1800 g grenade is a rest on a table when it undergoes an elastic explosion, separating into three
pieces of mass 0.60 kg, 0.50 kg, and 0.70 kg. The 0.60 kg piece has velocity 3.5 m/s [W] and the 0.50
kg piece has velocity 4.0 m/s [S42°E). Find the velocity of the third piece.