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Motion in A Straight Line question

2003 · Q152
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Motion in A Straight Line question

2003 · Q152

NEETPhysicsMotion in A Straight LineMCQ+4 / −1
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 g = 9.8 m/s2)
  1. A
    more than 19.6 m/s
  2. B
    at least 9.8 m/s
  3. C
    any speed less than 19.6 m/s
  4. D
    only with speed 19.6 m/s.
View written solutionFree

Correct answer: A

When more than two balls means minimum three balls are in the sky then time of flight for the first ball should be more than 4 s.

T > 4 s

2ug{{2u} \over g}g2u​ > 4

⇒\Rightarrow⇒ u > 19.6 m/s

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