A particle is projected from earth surface with a velocity \( \mathrm{P} \) . \( \sqrt{\frac{4 g...

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A particle is projected from earth surface with a velocity
\( \mathrm{P} \) . \( \sqrt{\frac{4 g R}{3}} \) in upward direction where \( R \) is the radius of earth. Find

W the velocity of particle when it is at half its maximum height.
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