A Stationary Firecracker Explodes, Breaking into Two Parts of Equal

A stationary firecracker explodes, breaking into two parts of equal mass. One part is moving north at 20 m/s. The velocity of the other part is

A) 20 m/s with a direction that's impossible to predict without more information.
B) also northward at 20 m/s.
C) zero.
D) southward at 20 m/s.
E) impossible to predict without more information.