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CBSE Class 11-science Answered

Topper has shown one video where it was given that the vector a=20 and vector b=10 gives us the resultant vector c=10 but how??this does not fit the rule vector a + vector b = vector c.plz xplain me with diagram?
Asked by | 05 Jun, 2011, 12:00: AM
answered-by-expert Expert Answer
This is very simple as the two vectors are directed in opposite directions.
 
Resultant, c =  sqrt (a2 + b2 + 2 a b cos?) = sqrt (400 + 100 + 2 x 20 x 10 cos 180)
               c = sqrt (500 - 400) = 10
Answered by | 13 Jun, 2011, 11:30: AM

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