A man throws balls with the same speed vertically upwards one after...

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A man throws balls with the same speed vertically upwards one after the other at an interval of
\( P \) 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time?
W
(Given \( g=9.8 \mathrm{~m} / \mathrm{s}^{2} \) )
(a) more than \( 19.6 \mathrm{~m} / \mathrm{s} \)
(b) at least \( 9.8 \mathrm{~m} / \mathrm{s} \)
(c) any speed less than \( 19.6 \mathrm{~m} / \mathrm{s} \)
(d) only with speed \( 19.6 \mathrm{~m} / \mathrm{s} \)
\( (2003) \)
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