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The position vector veca of a point (m,1...

The position vector `veca` of a point (m,12) is such that `|veca|`=13, find the value of m.

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The position vector of the point (m,12) is `mhati+12hatj`
`:. Veca=mhati+12hatj`
`rArr |veca|=sqrt(12^(2)+m^(2))`
Now `|veca|=13`
`rArr 13=sqrt(144+m^(2))`
`rArr m= +-5`
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