Considering newton’s laws of motion, do space ships need constant thrust in space?

Considering newton’s laws of motion, do space ships need constant thrust in space?

Lets presume there is a massive space ship like in the movie Passengers. Of course the ship hits some debris in the beginning but for the rest of the movie, the thrusters remain on in the ship. But why? Considering newtons laws of motion, if the ship accelerates to peak velocity and turn the engine is off, wouldn't it just continue going out that peak velocity? Why do they express in science fiction works that the engines must be kept on in space just like an airplane would on Earth?

Submitted August 01, 2017 at 08:51PM by Xilc
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Considering newton’s laws of motion, do space ships need constant thrust in space?

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