A block of mass 2 kg has only two forces acting on it. physics & forces

Question

A block of mass 2 kg has only two forces acting on it. One of those forces is directed south and has a magnitude of 9N. If the block accelerates toward the east at 6 m/s, determine the magnitude of the other force acting on the block.

Answer 1

Total force =ma=2*6=12N

other force^2=12^2+9^2

other force is 15N