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The sum of two forces is 18 N and resultant whose direction is at right angles to the smaller force is 12 N.the magnitude of the forces are
Suppose those two forces are P & Q.Hence according tge questionP+ Q = 18And resultant of P &Q when they are at 90 degrees== 12NowP^2- Q^2 = 144 hence (P+Q) (P-Q) = 144But P+Q = 18Hence P-Q = 8On solving equations P= 13 NQ = 5 N
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