Kinematics Question 454

Question: If a¯1 and a¯2 are two non-collinear unit vectors and |a¯1+a¯2|=3, then the value of (a¯1a¯2).(2a¯1+a¯2) it’s

Options:

A) 2

B) 3/2

C) ½

D) 1

Show Answer

Answer:

Correct Answer: C

Solution:

[c] |a¯1+a¯2|=a12+a22+2a1a2cosθ=3
cosθ=12

(a¯1a¯2)(2a¯1+a¯2)=2a12a22a1a2cosθ=12



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