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The 'e' Equation

A particle of...

Question

A particle of mass $m$ moves along line $P C$ with velocity $v$ as shown in the figure above. What is the angular momentum of the particle about $P$ ?

m v L

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m v I

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m v r

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z e r o

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Solution

The correct option is D $z e r o$
$L = m (\to r \times \to v)$
As here angle between $r$ and $v$ is Zero.
Thus angular moment about P, $L_{P} = m r v s i n (0^{o}) = 0$

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