Changing the course of an asteroid

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Cret
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Hello all,

I am really having trouble with following. I want to find the answer myself, but i do not know what equation/s i should apply to solve the problem.

My Question.

How long will it take to deflect an asteroid on a collision course with Earth by attaching a 2000N thruster. I must change the course of the asteroid by 12 Earth diameters.

Thank you in advance
 
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This should be in the homework help section. Also do you have more information, such as the mass of the asteroid?