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Q.

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 balls are in the sky at any time ? (given g = 9.8 m/s2)

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a

More than 19.6 m/s

b

At least 9.8 m/s

c

Only with speed 19.6 m/s

d

Any speed less than 19.6 m/s

answer is A.

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Detailed Solution

In this case time of flight of a ball ≥ 4 s
But time of flight = 2ug
so, 2ug≥4⇒u≥19.6m/s

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