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

Answer

A

Explanation

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.