two forces 5 kgf and 10 kgf are acting at an angle of 120⁰ calculate the magnitude and direction of the resultant force.

Forces are vectors and obey parallelogram law of vector addition

Magnitude of the resultant is given by

Since only the magnitude of the forces are given in question its direction cannot be specified, only it can be said that the resultant passes 30^o inclined to the 10kgf force.