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Find the resultant of two vectors P = 3 i + 2 j and Q = 2 i + 3 j. In solution of this question to find resultant they have directly added P and Q and then found magnitude of it. But they have not used the formula for finding resultant that is \/ P^2 + Q^2 + 2PQ cos(angle)

Find the resultant of two vectors P = 3 i + 2 j and Q = 2 i + 3 j.
 
In solution of this question to find resultant they have directly added P and Q and then found magnitude of it. But they have not used the formula for finding resultant that is \/ P^2 + Q^2 + 2PQ cos(angle)

Grade:12th pass

2 Answers

Deepak Kumar Shringi
askIITians Faculty 4405 Points
2 years ago
both are the same thing you can also do it by formula or you can add them and then get the magnitude the 2ndformula is bascially derived from the 1stone only
Arun
25763 Points
2 years ago
Dear Aabha
 
if P and Q are same what you have written then directly P+Q should be wrong.
 
Resultant = sqrt (P^2 + Q^2 + 2PQ cos @)   
this should be used

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