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Grade 11Vectors

p vector ( p vector + q vector + r vector ) = p sqare . find angle between p and q

Profile image of ishani
8 Years agoGrade 11
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1 Answer

Profile image of Eshan
8 Years ago
Dear student,

Since\vec{p}.(\vec{p}+\vec{q}+\vec{r})=p^2

we have,p^2+\vec{p}.(\vec{q}+\vec{r})=p^2\implies \vec{p}.(\vec{q}+\vec{r})=0

Therefore, all we can comment is that\vec{p}must be perpendicular to\vec{q}+\vec{r}.

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