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A mass m is at a distance a from one end...

A mass m is at a distance a from one end of a uniform rod of length l and mass M. Find the gravitational force on the mass due to the rod.

A

`(GMm)/(r(r+l)`

B

`(GM)/(r^(2)`

C

`Mmr^(2)+l`

D

`(r^(2)+l)mM`

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