To estimate the height of a bridge over a river, a P stone is dropp...

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To estimate the height of a bridge over a river, a
P stone is dropped freely on the river from the bridge. The stone takes \( 2 \mathrm{~s} \) to touch the water surface of the
W river. Calculate the height of the bridge from the water level. [Take \( g=9.8 \mathrm{~m} / \mathrm{s}^{2} \) ]
(1) \( 19.6 \mathrm{~m} \)
(2) \( 9.8 \mathrm{~m} \)
(3) \( 21.4 \mathrm{~m} \)
(4) \( 4.9 \mathrm{~m} \)
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