A 100-Kg Cannon Is Placed on a Frozen Pond

Multiple Choice

A 100-kg cannon is placed on a frozen pond. It fires a 0.50-kg projectile at 20 m/s at an angle of 60^o with the surface of the pond. Ignoring friction, the recoil speed of the cannon is

A) 0.20 m/s.
B) 0.12 m/s.
C) 0.10 m/s.
D) 0.09 m/s.
E) 0.05 m/s.