If you were in a spacecraft moving at 1000 miles/hour in outer space and you turned off the engines, what would happen to the speed and direction of your spacecraft & why?

Question

If you were in a spacecraft moving at 1000 miles/hour in outer space and you turned off the engines, what would happen to the speed and direction of your spacecraft & why?

In: 13

Answer 1

I’m absolutely clueless on these subjects: does one need have the engines on in the first place?

As space is a vacuum does the thrust developed by the spacecraft have any effect? Wouldn’t it continue to move as it was, regardless if the engines was on or off?