Given that vec A, + ,vec B, = ,vec C,. If left| {vec A} right|, = ,4,,,left| {vec

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3-1.Vectors

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Given that $\vec A\, + \,\vec B\, = \,\vec C\,.$ If $\left| {\vec A} \right|\, = \,4,\,\,\left| {\vec B} \right|\, = \,5\,\,$ and $\left| {\vec C} \right|\, =\,\sqrt {61}$ the angle between $\vec A\,\,$ and $\vec B$ is ....... $^o$

A

$30$

B

$60$

C

$90$

D

$120$

Solution

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Standard 11

Physics

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