Physics
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments

Depends on the total mass of all the fragments
Is infinity
Depends on the speeds of various fragments
Is zero

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

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

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