Que 19. An inflated balloon with a heavy rock tied to it submerges in water. As the balloon sinks deeper and deeper, the buoyant force acting it :
(A) increases
(B) remains nearly unchaged
(C) decreases
(D) Intially increases and then decreases

Dear Student,
buoyant force FB= v×ρ×gv is volume of submerged body,ρ is density of liquidg is acceleration due to gravityas the baloon is completely submerged and is sinking into water,the volume of baloon will reduce as pressure will increase with depth inside water.Density of water remains nearly constant.Thus buoyant force will decrease. 

Thus option (c)

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