Physics
When a bullet is fired from a gun

The gun jumps up
The gun does not move
The gun recoils with the same momentum as the bullet
The gun moves forward

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Absence of gravity outside

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