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Which of the diagrams in figure, correct...

Which of the diagrams in figure, correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient depth to impart if a terminal velocity ?

A

B

C

D

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The correct Answer is:
B
When an iron sphere falls freely in a lake, its motion is accelerated dur to gravity and retarded due to viscous force. The overall efect is increase in velocity and hence increase in `K.E.` till the spher acquires terminal velocity, which is constant. hence `K.E.` of sphere beyond this depth of lake becomes constant. Choice (b) is most appropriat.
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