Kinematics Question 297

Question: If A and B are perpendicular vectors and vector A=5i^+7j^3k^ and B=2i^+2j^ak^. The value of a is [EAMCET 1991]

Options:

A) 0

B) A2B2

C) B×A

D) 2(B×A)

Show Answer

Answer:

Correct Answer: D

Solution:

(A+B)×(AB)

=A×AA×B+B×AB×B

=0A×B+B×A0

=B×A+B×A=2(B×A)



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