In the descent vehicle moving vertically downward to the ground with an acceleration of 0.8 g, the cosmonaut presses

In the descent vehicle moving vertically downward to the ground with an acceleration of 0.8 g, the cosmonaut presses on the chair with a force of 240 N. What is the reaction force on the side of the chair?

The cosmonaut’s action on the chair and the chair’s reaction to this action form an action-reaction pair. In accordance with Newton’s law, action and reaction are equal in absolute value and directed in opposite directions. If the astronaut presses down on the chair with a force of 240 N, then the reaction from the side of the chair is also 240 N and is directed upwards.
Answer: 240 N.