Kinematics Question 274

Question: The vector P→=ai^+aj^+3k^ and Q→=ai^−2j^−k^ are perpendicular to each other. The positive value of a is [AFMC 2000; AIIMS 2002]

Options:

A) 3

B) 4

C) 9

D) 13

Show Answer

Answer:

Correct Answer: A

Solution:

P¯.Q¯=0

a2−2a−3=0 therefore a=3

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