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

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 s.What should be the speed of the throw,so that more than two balls are in the sky at any time? (take,g=9.8ms⁻²)

Options

(a) Any speed less than 19.6 ms⁻¹
(b) only with speed 19.6ms⁻¹
(c) More than 19.6 ms⁻¹
(d) At least 9.8 ms⁻¹

Correct Answer:

More than 19.6 ms⁻¹

Explanation:

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