Discussion
Assertion (A): Streamlining a body increases its wetted area yet reduces its total drag.
Reason (R): Streamlining delays separation and so cuts the pressure drag sharply.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. The gentler rear taper keeps the flow attached and leaves a narrow wake, and the pressure drag saved far exceeds the extra friction the longer surface costs. On a bluff body the pressure term is the one worth attacking.
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