An Astronaut (in space) is outside of his spaceship, repairing it by hammering a

Question

An Astronaut (in space) is outside of his spaceship, repairing it by hammering a loose rivet back into place. What happens to him as he swings the hammer?

Please expaing in detail to get all points.

a. Nothing happens: the spaceship absorbs the momentum of the hammer.

b. His center of mass moves towards the spaceship as he swings the hammer back and moves away from it as he swings the hammer forward.

c. His center of mass moves away from the spaceship as he swings the hammer back and moves toward it as he swings th hammer forward.

Explanation / Answer

he moves towards the spaceship as he pulls the hammer back and moves away from it as he swings the hammer forward

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