Question

A man first swims in sea water and then in river water.
(i) Compare the weights of sea water and river water displaced by him.
(ii) Where does he find it easier to swim and why?

  • Upthrust in Fluids Archimedes' Principle and Floatation Class 9 ICSE
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Answer

(i) In each case the weight of water displaced will be equal to the weight of the man.

Hence, the ratio weights of sea water and river water displaced by him will be 1:1.

(ii) The man finds it easier to swim in sea water because the density of sea water is more than that of the river water, so his weight is balanced in sea water with his less part submerged inside it.

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