7. Two forces are such that the sum of their
magnitudes is 18 N, the resultant is 228 when
they are at 120°. Then the magnitude of the
forces are
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Lets assume,
A is first force and B is another.
according to given condition. (1)
A + B=18....... (1).
according to given condition. (2)
The resultant is 228 when theta =120°
let's put formula in the case when theta =120° and The resultant is 228.
R =√ A^2 + B^2 + 2AB cos theta
√228= A + B + √2AB cos theta
228= √324 + 2AB - 1/2
√228=324-2AB +1/2
324 - 15 -1/2=2AB
308.5/2 = AB
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