A ball is thrown vertically upwards with a velocity of \( 25 \mathrm{~ms}^{-1} \) from the top o...

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A ball is thrown vertically upwards with a velocity of \( 25 \mathrm{~ms}^{-1} \) from the top of a tower of height \( 30 \mathrm{~m} \). How long will it travel before it hits ground
[Kerala PET 2007]
(a) \( 6 s \)
(b) \( 5 \mathrm{~s} \)
(c) \( 4 \mathrm{~s} \)
(d) \( 12 \mathrm{~s} \)
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