A Boulder can be seen easily flowing during flood but can be seen sinking in river. Give reasons .
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Because the velocity of the water flow is very high and can carry the stone or Boulder whereas ,when we drop a stone onto a river which is not moving at all and it does not affect the weight of the stone.
ShivaniPatel:
i don't want the answer on the basis of velocity
i want the answer on the basis of buoyant force and density
ok
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