Find the magnitude of the resultant vector of two 5-pound forces that act on an object with an angle of 70° between them.

Answer 1

let
u = (5,0)
v = (5cos70°,5sin70°)
then
u+v = (5(1+cos70°),5sin70°) = (6.71,4.70)
now just get |u+v| and its direction