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  4. A raindrop falling from a height h above the ground attains the terminal velocity when it has fallen through a height (4/5) h . The diagrams shown in figure, which correctly shows the change in potential and kinetic energy of the drop during its fall up to ground is

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Q. A raindrop falling from a height h above the ground attains the terminal velocity when it has fallen through a height $\frac {4}{5}\, h$ . The diagrams shown in figure, which correctly shows the change in potential and kinetic energy of the drop during its fall up to ground is

Solution:

When raindrop falls, first velocity increases, hence, first KE also increase. After sometime speed is constant hence KE also becomes constant. PE decrease continuously as drop is falling continuously.