A man throws ball 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 ball are in the sky at any time (Given `g=10(m)/(2^2)`)
A. Any speed less than `19.6 m//s`
B. Only with speed `19.6 m//s`
C. More than `19.6 m//s`
D. Al least `9.8 m//s`
