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  • 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 it a terminal velocity?

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 it a terminal velocity?

Answers (1)

The answer is the option (b)

The velocity of the iron sphere when free-falling in the lake increases as acceleration due to gravity increases. The up-thrust of the water, however, opposes the motion of the sphere which makes the velocity constant after some time. Hence, in this case, the velocity increases initially and then becomes constant after some time. So, kinetic energy becomes constant, eventually, which is shown in graph b.

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