A stone is dropped from the top of the tower. Its P speed after it ...

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A stone is dropped from the top of the tower. Its
P speed after it has fallen \( 20 \mathrm{~m} \) is [Take \( g=10 \mathrm{~ms}^{-2} \) ]
(1) \( -10 \mathrm{~ms}^{-1} \)
(2) \( 10 \mathrm{~ms}^{-1} \)
W
(3) \( -20 \mathrm{~ms}^{-1} \)
(4) \( 20 \mathrm{~ms}^{-1} \)
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