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2015-08-15T23:29:51+08:00

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Because, there is a force from the ground to the spaceship and force from the ground to the spaceship

Remember, Law of Interaction states that at every action force there is a reaction force. this can be stated in equation form
 F_{xy}=-F_{yx}

where,
F_{xy} is a force from object x to object y
 F_{yx} is a force from object y to object x

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