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 air at any time (Given g=9.8m/ $s^{2}$ ⁾

At least 0.8 m/s

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Any speed less than 19.6 m/s

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Only with speed 19.6 m/s

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More than 19.6 m/s

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Solution

The correct option is D More than 19.6 m/s
Interval of ball throw 2 sec
If we want that minimum three (more than two) ball remain in air then
time of flight of first ball be greater than 4 sec.
T $>$ 4 sec
$\frac{2 u}{g} > 4$ sec $\Rightarrow u > 19.6 m / s$
for u=19.6. First ball will just strike the ground
second ball will be at highest point
Third ball will be at point of projection or at ground

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