Kinematics Question 306

Question: If a vector $ \vec{A} $ it’s parallel to another vector $ \vec{B} $ then the resultant of the vector $ \vec{A}\times \vec{B} $ will be equal to [Pb. CET 1996]

Options:

A) + 11 J

B) + 7 J

C) + 13 J

D) ? 7 J

Show Answer

Answer:

Correct Answer: B

Solution:

$ W=\overrightarrow{F}.\overrightarrow{s} $

$ =(5\hat{i}+3\hat{j}).(2\hat{i}-\hat{j}) $

$ =10-3 $ = $ 7J $



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