A man throws balls with the same speed vertically upwards one after the other at an interval of ...

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