A stone thrown upwards with a speed ' \( u \) ' from the \( \mathrm...

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A stone thrown upwards with a speed ' \( u \) ' from the
\( \mathrm{P} \) top of the tower reaches the ground with a velocity

W \( 3 u^{\prime} \). The height of the tower is:
(1) \( \frac{4 u^{2}}{g} \)
(2) \( \frac{4 u^{3}}{2 g} \)
(3) \( \frac{8 u^{2}}{g} \)
(4) \( \frac{7 u^{2}}{g} \)
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