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 in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground ?

Options

A.
B.
C.
D.

Answer

B

Explanation

At a height `h` above the ground, `P.E.` of raindrop is maximum and `K.E.=0` . As the raindrop falls, its `P.E.` goes on decreasing and K.E. goes on increasing upto a point `h//4` above the ground. At this stage, rain drop has acquired near terminal velocity `(=` constant ). Therefore, at this stage, K.E. tends to be constant. P.E. becomes zero when raindrop falls to the ground. Choice (b) is most appropriate.