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NEET2003PhysicsMotion in One DimensionActual

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?

Options

  1. Amore than 19.6 ~m / s
  2. Bat least 9.8 ~m / s
  3. Cany speed less than 19.6 ~m / s
  4. Donly with speed 19.6 ~m / s

Correct answer

A. more than 19.6 ~m / s

Step-by-step solution

From question Interval of ball thrown =2 sec If we want that minimum three balls remain in air then time of flight of first ball must be greater than 4 sec. aligned & T>4 sec & 2 u g >4 sec & u>19.6 ~m / s aligned

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