Can ever three vectors of different magnitude be added to get null vector?

Yes. If all the three vectors lie in the same plane, three vectors of different magnitude can be added. 
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The two equal velocities have got a resultant equal to either. What is the angle between them?

The angle between the vectors is 120 degree

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If space space straight A with rightwards arrow on top plus straight B with rightwards arrow on top space equals straight C with rightwards arrow on top and straight A squared plus straight B squared equals straight C squared then what is the angle between vectors straight A with rightwards arrow on top space and space straight B with rightwards arrow on top?


The two vectors are perpendicular to each other. The angle between the vectors is 90 degree.

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Can ever two vectors of different magnitude be added to get null vector?


Two vectors of different magnitude cannot be added to get a null vector. 

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What is the minimum number of vectors of equal magnitude required to produce zero resultant?

Minimum number of vectors of equal magnitude to produce a zero resultant is 2. 

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