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

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

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Physics
The bats can fly in the dark because

They generate flashes of light
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators
They can see the objects in darkness

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