Two fat astronauts each of mass $120 k g$ are travelling in a closed spaceship moving at a speed of $15 k m$ inthe outer space far removed from all other material objects.

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Solution

Since the spaceship is totally isolated from surrounding and is removed from any material object so ,
nothing can be lost from the spaceship from which we can conclude that the total mass of spaceship remain unchanged and velocity will remain same even after they reduce their mass to 90 kg.

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Two fat astronauts each of mass 120kg are travelling in a closed spaceship moving at a speed of 15km inthe outer space far removed from all other material objects.

Since the spaceship is totally isolated from surrounding and is removed from any material object so , nothing can be lost from the spaceship from which we can conclude that the total mass of spaceship remain unchanged and velocity will remain same even after they reduce their mass to 90 kg.

Two fat astronauts each of mass $120 k g$ are travelling in a closed spaceship moving at a speed of $15 k m$ inthe outer space far removed from all other material objects.

Since the spaceship is totally isolated from surrounding and is removed from any material object so ,
nothing can be lost from the spaceship from which we can conclude that the total mass of spaceship remain unchanged and velocity will remain same even after they reduce their mass to 90 kg.