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Miike012

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and in my book they had an equation

F = (4)(pi)^2(m)(r)/T^2

then they said by using keplers law... they arrived to a new equation that relates the gravitational force exerted by the sun which is...

F = m/r^2

If Keplers law says T = r^3/2 how in the heck did they go from F = (4)(pi)^2(m)(r)/T^2

to F = m/r^2 by substituting T for r?

Where did (4)(pi)^2(r) go ?