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September 20, 2014

September 20, 2014

Posted by **Raf** on Tuesday, October 18, 2011 at 2:52pm.

a) What mathematical expression characterises the instant rate of change of the force F in respect to the distance (r) separating the two masses moving towards each other?

I got dF/dt = 2GmM/r^3 dr/dt

b) What's the rate of change?

No idea what to do here, they don't give me any numbers.

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