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

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A stone thrown upwards with a speed ' \( u \) ' from the top of the tower reaches the ground with a velocity
\( \mathrm{P} \) ' \( 3 \mathrm{u} \) '. The height of the tower is:

W
(1) \( \frac{3 u^{2}}{g} \)
(2) \( \frac{4 u^{2}}{g} \)
(3) \( \frac{6 u^{2}}{g} \)
(4) \( \frac{9 u^{2}}{g} \)
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