A 10 Kg Bomb Is Moving NORTH with a Velocity

Multiple Choice

A 10 kg bomb is moving NORTH with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0 kg fragment moving WEST with a speed of 8.0 m/s, a 4.0 kg fragment moving EAST with a speed of 10 m/s, and a third 1.0 kg fragment. What is the velocity of the third fragment?

A) zero
B) 40 m/s NORTH
C) 40 m/s SOUTH
D) none of these answers are correct