Two forces of 20 N and 5 N are acting at an angle of 120 degree between them. Find the resultant force in magnitude and direction ?

Answer 1

Use the 20N force as angle zero: <20,0>
Then the 5N force is <-4.33,2.5>

So, adding them up you get

<15.67,2.5>

Now just take the magnitude of that, and its direction angle θ has tanθ = 2.5/15.67