A particle moves with a speed \( v \) in a circle of radius \( R \). The \( x \)-component of th...

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A particle moves with a speed \( v \) in a circle of radius \( R \). The \( x \)-component of the average velocity of the particle in a halfrevolution, as shown in figure-3.76, is :
Figure \( 3.76 \)
\( (\dot{A})-\frac{v}{\pi} \)
(B) \( -\frac{v}{2 \pi} \)
(C) \( -\frac{v}{4 \pi} \)
(D) \( -\frac{2 v}{\pi} \)
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