Question

2. Two forces of 80 N and 70 N act simultaneously at a point. Find the resultant force, if the angle between them is 150°.

Answer 1

$given$

f1 =80 N

f2 = 70N

F=√f12 +f22+f1. f2

cosΦ F=√6400+4900+5600

cos 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 80.34N

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