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In an imaginary atmosphere, the air exerts a small force F on any particle in the direction of the particle’s motion. A particle of mass m projected upward takes a time t₁ in reaching the maximum height and t₂ in the return journey to the original point. Then

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$t_{1} = t_{2}$

$t_{1} < t_{2}$

$t_{1} > t_{2}$

the relation between t₁and t₂ depends on the mass of the particle.

answer is B.

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Detailed Solution

$a_{u p} = \frac{m g + F}{m}$

$a_{d o w n} = \frac{m g - F}{m}$

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