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    QP: https://8a40d6c38bafca75cc407741c0f3...%20Edexcel.pdf

    MS: https://8a40d6c38bafca75cc407741c0f3...%20Edexcel.pdf

    I am wondering why there is a minus sign even if the force and the motion of spacecraft are in the same direction (both are towards the centre of the Earth).

    Many thanks.
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    its a bit weird to explain but for this type of question the force is always negative
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    (Original post by beta_tester)
    its a bit weird to explain but for this type of question the force is always negative
    you mean the question involving earth and rocket?
 
 
 
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