Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They push each other apart. What is their separation after the heavier astronaut has moved 12. m?
A) 9. m
B) 24. m
C) 16. m
D) 21. m
E) 28. m

Question

Quizplus · Accepted Answer

By conservation of momentum, the center of mass remains stationary. The distance moved by the lighter astronaut is (80 kg / 60 kg) * 12 m = 16 m. The total separation is 12 m + 16 m = 28 m.

Two Astronauts, of Masses 60