JEE Main 2007 — Vector Algebra Question with Solution
JEE Main 2007
Question
The resultant of two forces and is a force of . If the direction of force were reversed, the resultant would be . The value of is
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Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
$\begin{aligned} & 7^2=P^2+3^2+2 \times 3 \times P \cos \theta \quad \dots(1)\\ & (\sqrt{19})^2=P^2+(-3)^2+2 \times(-3) \times P \cos \theta \quad \dots (2) \end{aligned}$ adding we get .
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This is a previous-year question from JEE Main 2007, covering the Vector Algebra chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.