A man throws balls with same speed verti...

A man throws balls with same speed vertically upwards one after the other at an interval of 2 s. What should be the speed of throw so that more than two balls are in the sky at any time?

More than 19.6 m/s

At least 9.8 m/s

Any speed less than 19.6 m/s

Only with speed 19.6 m/s

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