Answers

2016-03-25T12:41:40+05:30
Sine the density of the body A is lesser than that of the liquid , the net force experienced by the  body is UPWARDS.
since the density of the body B is greater than that of the liquid , the net force experienced by the body is DOWNWARDS.

REASON 
LET THE VOLUME OF THE BODIES A OR B BE V
DENSITIES BE Pa , Pb ,Pl.
let force F experienced by the body A IS GIVEN BY
F = Pl Vg - Pa Vg = [Pl -Pa]Vg
since Pl is greater than Pa so F IS POSITIVE AND ACTS UPWARDS

SIMILARLY IN CASE OB BODY B
F = [Pl - Pb]Vg
since Pl is less than Pb , F IS NEGATIVE AND ACTS DOWNWARDS
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