Mechanics 3 question about gravity..?

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reddtatsu

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"The magnitude of the grav force exerted by the Earth on a particle is proportional to the mass of the particle, and inversely proportional to the square of the distance of the particle from the centre of the Earth. The earth is modelled as a sphere of radius R and the acceleration due to gravity is g"

Show that, at distance x from the centre of the Earth, where x is greater than or equal to R, that the magnitude of the acceleration due to grav is given by:

gR^2/x^2

I can't figure out which equations to go through for this.

Any help would be appreciated greatly!
 
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