A stone is dropped from the top of a tower and one second later, a second stone is thrown vertic...

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A stone is dropped from the top of a tower and one second later, a second stone is thrown vertically downward with a velocity \( 20 \mathrm{~ms}^{-1} \). The second stone will overtake the first after travelling a distance of \( \left(g=10 \mathrm{~ms}^{-2}\right) \)
(a) \( 13 \mathrm{~m} \)
(b) \( 15 \mathrm{~m} \)
(c) \( 11.25 \mathrm{~m} \)
(d) \( 19.5 \mathrm{~m} \)
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