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The vector vecP=ahati+ahatj+3hatj and ve...

The vector `vecP=ahati+ahatj+3hatj and vecQ=ahati-2hatj-hatk`, are perpendicular to each other. The positive value of a is

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The correct Answer is:
A
Here `alpha=45^(@)` so inclination of AC with x-axis is `45^(@)`. So unit velocity along AC
`=cos 45^(@) hat(i) + sin 45^(@)hat(j)=(hat(i)+hat(j))/sqrt(2)`
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ALLEN -BASIC MATHS-Exercise-02
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