Q. In an imaginary atmosphere, the air exerts a small force on any particle in the direction of the particle's motion. A particle of mass ' ' projected upward takes a time in reaching the maximum height and in the return journey to the original point then :

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A

B

C

D

The relation between and depends on the mass of the particle

Solution:

Because in downward journey and Both will act downward, while in upward journey only mg will act downward.

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[Assume that rod does not exerts force in vertical direction]

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