



 
Hi Harsh. I've rewritten your question using bold face for the vector quantities and regular face for the scalar quantities:
The dot product of two threedimensional vectors is computed by adding together the products of the components in the same direction. In your question, this means 35 = U•V = 3U_{x }  6V_{y } + 1 The sum of these two vectors is simply the vector whose components are the sums of the components in the same direction: U + V = (U_{x }  3)i + (V_{y }  6)j + 2k And the magnitude of any vector is the square root of the sum of the squares of its components, so the magnitude of U + V is: 3 = U + V = sqrt( (U_{x }  3)^{2 } + (V_{y }  6)^{2 } + 2^{2 } ) Now you have two equations with two unknowns. Can you finish the question now? Hope this helps,  


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