17. The sum of the magnitudes of two forces acting at a point is 18 N and the magnitude of their resultant is 12 N. If the resultant is at 90° with the smaller force, the magnitude of the forces in newton are (a) 6, 12 (6) 11,7 (c) 5. 13 (d) 14, 4 lif

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( left.|a|+|b|=18 quad|2 N=| begin{array}{l}15 1end{array}right} ) ( a^{2}+b^{2}+2 a+c+0=-1+4 ) ( 12^{2}+a^{2}=b^{3} ) ( Rightarrow quad 124+a^{2}=b^{3} quadleft(m_{2} l ) fythgous right. ( Rightarrow quadleft(44-a^{2}-(18-a)^{2}right. ) ( 144-9^{2}=a^{2}-36 a+324 ) ( Rightarrow quad 36 q=180 ) ( Rightarrow quad a=5 ) (0) ontion ( therefore b=13 ) [ begin{array}{l}text { gine nating } R 12end{array} ]

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