When a gas jar full the lower jar go upward into the jar containing air. In this experiment :
(a) air is heavier than bromine
(b) both air and bromine have the same density
(c) bromine is heavier than air
(d) bromine cannot be heavier than air because it is going upwards against gravity
A body is projected vertically upward with an initial velocity u. If acceleration due to gravity is g, time for which it remains in air is: