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```        Q. The sum of the magnitudes of two forces acting at a point is 18 and the magnitude of their resultant is 12. if the resultant is at 90degree with the force of smaller magnitude , what are the , magnitude of the forces?
a)12,5            b)14,4              c)5,13                  d)10,8```
7 years ago

abhishek athreya
19 Points
```										let the forces be F1 and F2
F1+F2=18----------(1)
let the angle between them be 'a'
let their resultant be R
F1^2+F2^2+2FI*F2*cos(a)=R^2--------------------(2)
also
tan90=F2sin(a)/F1+F2cos(a)------------------------(3)

solve (1) (2) and (3)
u will get F1 = 5
and F2=13

hope it helped
```
7 years ago
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