Q. 15

The magnitude of

Answer :

Given: Two vectors and


To Find: Projection of on


We know, projection of on is =


Similarly, The magnitude of projection of on is,



OR


Given: A vector is given.


To Find: A vector opposite to the given vector of magnitude 5.


Let


So,


Therefore, the unit vector opposite to the vector is,



So, the vector of magnitude 5 is,



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