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Foot of the Perpendicular from a Point on a Plane

Consider a F ...

Question

Consider a F=4i-3j.Another vector perpendicular of F is
(1) 3i-4j or (2) k cap

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Solution

If two vectors are perpendicular
then the dot product will be 0
here 4i-3j is the given vector
(4i-3j).k=(4i-3j+0j).(0i+0j+k)=0
So k cap is perpendicular to the given vector

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