A 40-Kg Mass Has a Velocity of 4 $\degree$ North of East

Multiple Choice

A 4.0-kg mass has a velocity of 4.0 m/s,east when it explodes into two 2.0-kg masses.After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60 $\degree$ north of east.What is the magnitude of the velocity of the other mass after the explosion?

A) 7.9 m/s
B) 8.9 m/s
C) 7.0 m/s
D) 6.1 m/s
E) 6.7 m/s