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Find the resultant of two forces 80N and 70N having an angle of 150 degrees between them
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f1 =80 N

 f2 = 70N

 F=√f12 +f22+f1. f2 cosΦ

 F=√6400+4900+5600cos 150°

 F=√ 11300+5600 . -√3/2

 F =√11300+2800.-√3

 F=10√113-28√3

 F=10√113-(28x1.73)

 F=10√113-48.44

 F=10√64.56

 F=10×8.034

 F =80.34 N
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