Answer Posted / bejoy

assuming both baloons to be having same volume..then both
will have same bouyantic force acting on them..now again as
u know a cylnder of same volume has more surfce area, the
weight of rubber used for a cylinderical baloon would b
higher(assuming same thicknes for both baloons), so
spherical will weigh lesser..now assuming again that the
same amount of rubber is used for both,then just drag
decides..and drag is decided by the configuration in which
the balon is rising..even a cylindircal baloon can rise
faster(assuming it to be going up length wise) if its
properly configured and left..assuming again no disturbing
forces in air..

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