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# M3 IAL June2015 Q2(b)

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1. 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.
2. (Original post by Kamisama)
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.
Positive acceleration is always in the direction of x increasing.
3. (Original post by AlmostNotable)
Positive acceleration is always in the direction of x increasing.
Thank you.

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