(Un) Realistic Situation 1

Two fat astronauts each of mass 120kg120 kg are traveling in a closed spaceship moving at a speed of 15kms115 km s^{-1} in the outer space far away from any other object. The total mass of the spaceship including the astronauts is 660kg660 kg.

If the astronauts try to do slimming exercise & succeed in bringing their weights down to 90kg90 kg each (this is sure to make the women jealous), with what velocity will the spaceship finally move in kms1km s^{-1}?


You can also try (Un) Realistic Situation #2.

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