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Q.

A raindrop falling from a height ‘h’ above ground, attains a near terminal velocity when it has fallen through a height (3/4)h. Which
of the diagrams shown below correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground ?

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a

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b

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c

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d

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answer is B.

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Detailed Solution

  • When a raindrop is h above the earth, its PE is at its maximum and its KE is zero. 
  • Up to a certain point, the raindrop's PE continues to decrease and its KE continues to increase h/4 above the surface. 
  • Raindrops have reached their near-terminal velocity (i.e., constant) at this point. 
  • As a result, KE tends to remain constant at this point. When a raindrop hits the ground, PE is zero.

Hence the correct answer is option B.

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