vectors

Question: The magnitudes of vectors $\vec A,\,\vec B$and$\vec C$are 3, 4 and 5 units respectively. If $\vec A + \vec B = \vec C$, the angle between $\vec A$and $\vec B$is

1) $\frac{\pi }{2}$

2) ${\cos ^{ - 1}}(0.6)$

3) ${\tan ^{ - 1}}\left( {\frac{7}{5}} \right)$

4) $\frac{\pi }{4}$

Solution:

Explanation: Explanation

addition-subtraction-vectors

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