A spacecraft moving in space free from the gravitational field must change the direction of its motion to the opposite, maintaining its speed in magnitude. For this, two methods are proposed: 1) first slow down the ship and then accelerate it to its previous speed; 2) turn, forcing the ship to move in a circular arc, giving it acceleration in the transverse direction. Which of these two methods will require less fuel? The speed of gas flow relative to the core
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