Q. 124.8( 5 Votes )

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
A. t1 < t

B. t1 > t2

C. t1 = t2

D. the relation between t1 and t2 depends on the mass of the particle.

Answer :

When the particle moves in the upward direction the net acceleration is (g-a) which decreases the net force on the particle and the particle is able to move for larger time while moving downward the net acceleration increases (g+a) and the particle reaches ground faster. Thus, .

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