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ABC is triangle, right angled at A. The resultant of the force acting along AB,AC with magnitudes 1AB and 1AC respectively is the force along AD, where D is the foot of the perpendicular from A onto BC. The magnitude of the resultant is :


( A ) (AB)(AC)AB+AC
( B ) 1AD
( C ) 1AB+1AC
( D ) AB2+AC2(AB)2(AC)2

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