Kinematics Question 424

Question: The vector P=ai^+aj^+3k^ and Q=ai^2j^k^ are perpendicular to each other. The positive value of a is

Options:

A) 3

B) 4

C) 9

D) 13

Show Answer

Answer:

Correct Answer: A

Solution:

[a] P.Q=0

a22a3=0

a=3



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