NEET 2003 Physics question
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 sky at any time ? (Given )
Answer: (1)
Solution
Balls are thrown every 2 s. For more than two balls to be in the air at any time, the time of flight of one ball must be more than s. Time of flight \frac{2u}{g}$ > 4 ⇒ u > 2g =
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