Help me please ?

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1 Answer
Dec 8, 2017

option #C#

Explanation:

The vector #-2hati+3hatj# is drawn on diagram benter image source here

the angle required is #theta#

we find #alpha# fro the right angled triangle

#alpha=tan^(-1)(3/2)=56^0#to nearest degree

#:. theta=180-56=124^0#