Question

Three forces f 1=(i^j^+k^)n,f2=(i^+j^k^)n and f 3=(i^+j^+k^)n act on a particle. The resultant (net) force acting on the particle is

Answer 1

Plot them graphically then take resultant of 1 and 2 vector then take the 3 vector and the resultant of the vector's resultant. In some cases one of them gets cancelled out then you have to work with only one. Plot them