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Q.

Which of the following option correctly describes the variation of the speed v and acceleration ‘a’ of a point mass falling vertically in a viscous medium (under gravity) that applies a force F=kv, where ‘k’ is a constant, on the body? (Graphs are schematic and not drawn to scale)

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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 C.

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Detailed Solution

When a point mass is falling vertically in a viscous medium, the medium or viscous fluid exerts drag force on the body to oppose its motion and at one stage body falling with constant velocity.

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