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9. Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller force and magnitude of resultant is 12 N. Then the magnitudes of the forces are

(a)  12 N, 6 N                            (b)  13 N, 5N

(c)   10 N, 8 N                            (d)  16 N, 2 N

Ans. b

(5)

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