Assertion :An object falling from a great height may reach a steady terminal velocity. Reason: The viscous force on the body is responsible for this steady terminal velocity.

Statement I is True and Statement II is True and is a correct explanation of Statement I.

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Statement I is True and Statement II is True but not a correct explanation of Statement I.

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Statement I is True and Statement II is False

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Statement I is False and Statement II is True.

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Solution

The correct option is A Statement I is True and Statement II is True and is a correct explanation of Statement I.
An object falling from a great height first accelerates due to gratuity but as its velocity increases, the viscous force increases, this keep on increases to a point where the viscous and buoyant force balances the weight of the body and thus a terminal velocity is reached.
The equilibrium equation,
$6 π η r v + v ρ_{a i r} g = V ρ g$
(viscous force)(buoyant force) (weight of the body)

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