13. Two forces Fı = < -20, 15 > and F2 = < 10, 30 > act on an object. Find the resultant force F = F1 +F2. (i) F = < -30, –45 > (ii) F = < -200, 450 > (iii) F = < 30, 15 > (iv) F = < –10,45 > (v) not listed (vi) does not exist O i O i iv O v

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