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add vectors of length  20 and 40 units. Magnitude?

 Dec 23, 2014

Best Answer 

 #1
avatar+33603 
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It depends on the angle bwteen them.  If they are in line then the magnitude of the resultant is just 20 + 40.  However, if they are at right angles then the magnitude of their sum is √(202 + 402).  For a general angle between them use the cosine rule.

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 Dec 24, 2014
 #1
avatar+33603 
+5
Best Answer

It depends on the angle bwteen them.  If they are in line then the magnitude of the resultant is just 20 + 40.  However, if they are at right angles then the magnitude of their sum is √(202 + 402).  For a general angle between them use the cosine rule.

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Alan Dec 24, 2014

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