When vector $\overrightarrow { \mathrm { A } }$ is added to vector $\vec { B }$ ,which has a magnitude of 5.0,the vector representing their sum is perpendicular to $\overrightarrow { \mathrm { A } }$ and has a magnitude that is twice that of $\overrightarrow { \mathrm { A } }$ .What is the magnitude of $\overrightarrow { \mathrm { A } }$ ?
A)2.2
B)2.5
C)4.5
D)5.0
E)7.0

Question

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The Answer of When vector $\overrightarrow { \mathrm { A } }$ is added to vector $\vec { B }$ ,which has a magnitude of 5.0,the vector representing their sum is perpendicular to $\overrightarrow { \mathrm { A } }$ and has a magnitude that is twice that of $\overrightarrow { \mathrm { A } }$ .What is the magnitude of $\overrightarrow { \mathrm { A } }$ ?
A)2.2
B)2.5
C)4.5
D)5.0
E)7.0

When Vector A→\overrightarrow { \mathrm { A } }A Is Added to Vector

When Vector $\overrightarrow { \mathrm { A } }$ Is Added to Vector