If an astronaut in space pushes off the satellite she is working on, what will happen to her if there are no other acting external forces?

A) She will eventually slow down and come to a stop.

B) She will continuously speed up.

C) She will periodically change direction.

D) She will move in the same direction at the same speed forever.

Respuesta :

In the absence of an external force on the astronaut, she will move in the same direction at the same speed forever.

According to the principle of conservation of linear momentum, in a closed or isolated system (absence of external force), the total momentum is always conserved.

[tex]m_a v_a = m_sv_s[/tex]

where;

  • [tex]m_a[/tex] is the mass of the astronaut
  • [tex]m_s[/tex] is the mass of the satellite
  • [tex]v_a[/tex] is the speed of the astronaut
  • [tex]v_s[/tex] is the speed of the satellite

Thus, in the absence of an external force on the astronaut, she will move in the same direction at the same speed forever.

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