Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water
The sea is wider than the river

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Physics
Acceleration is

Inversely proportional to mass
Inversely proportional to force
Directly proportional to mass
Directly proportional to force

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