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Two fat astronauts each of mass 120 kg a...

Two fat astronauts each of mass 120 kg are travelling in a closed spaceship moving at a speed of 15 km/s in the outer space far removed from tall other material objects. The total mass of the spaceship and its contents including the astronauts is 660 kg. If the astronauts do slimming exercise and thereby reduce their masses to 90 kg each, with what velocity will spaceship move?

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A
Since the spaceship is removed from any material object nd totly isolated from surrounding the mass oss by astronouts couldn't slip away from the space ship. So the total mss of the space ship remains uncchanged and also its velocity.
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  15. A body of mass m moving with velocity v collides head on with another ...

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