Answer to Question #169381 in Mechanics | Relativity for Zulehat

Question

An object is acted upon by two forces 20N each .The angle between the forces is 120 degrees.The resultant force on the object has the magnitude of what

Answer 1

$F_{res}=\sqrt{F_1^2+F_2^2+2F_1F_2cos\alpha},$

$F_1=F_2=F=20~N,$

$F_{res}=\sqrt{F^2+F^2-F^2}=F=20~N.$