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Finding resultant of a system of forces ...

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astarmathsandphysics:
I answered you question at the link I posted above.

aiyla:
as far as i know .. doing the horizontal components we have to use  ucos
while doing vertical ones we have to use usin

you did like this


Resolving Vertically: 40+60cos 70 -50sin30 = 35.52N

Resolving Horizontally: 80-60sin 70-50cos 30 = -19.68N


so how is that ?  this part i want to know how can cos and sin be together in verticall or horizontal part ?

astarmathsandphysics:
You can use cos only for horizontal forces ONLY if the angles are between the force and the horizontal. That is not the case with your example.

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