Physics-
General
Easy

Question

A body freely falling from the rest has a velocity ´ v ´ after it falls through a height ‘h ´.
The distance it has to fall down for its velocity to become double, is

  1. 2 h  
  2. 4 h  
  3. 6 h  
  4. 8 h  

The correct answer is: 4 h


    Let at point A initial velocity of body is equal to zero
    for path A B colon v to the power of 2 end exponent equals 0 plus 2 g h blank open parentheses i close parentheses
    for path A C colon open parentheses 2 v close parentheses to the power of 2 end exponent equals 0 plus 2 g x
    4 v to the power of 2 end exponent equals 2 g x(ii)
    Solving (i) and (ii),blank x equals 4 h

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