1.

Three vectors of magnitudes respectively, 1 unit, 2 units and 3 units are directed along the threesides of an equilateral triangle. Then the resultantof the three vectors is of -(A) 1 unit(B) 2 unit(C) 13 units (D) 14 units​

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Answer:

In this  case I am assuming the side of 3 unit to be the base directed along x- axis = 3i

The remaining two are INCLINED to the base at an angle of 60

I am assuming 1 unit to be inclined along positive x axis therefore

1= i÷2 + √3j÷2

Similarly for 2 units it is in opposite direction

2=-i +√3j

Adding all the three vectors , the resultant BECOMES 5i÷2 +3√3j ÷2

resultant =  √ (25+27)÷4= √13  is the RIGHT answer



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