Assertion :An object from a greater height reaches a steady terminal velocity. Reason: The viscous forces on a body depends upon its velocity. The greater the velocity the greater is the viscous force.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Gravity first causes object to fall with increasing speed, but as it speeds up backward dragging force i.e. viscous force increases. Eventually the viscous force is enough to balance the force of gravity, so the acceleration stops and the sphere reaches a steady terminal velocity.
The reason given is also true, but does not provide the correct explanation for the assertion.

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