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Physics (answers included)

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Two mountains are 1.00 km apart. If their masses are identical (2.00 × 1010 kg), what is the force due to gravity between the mountains?
Fg=(GMm)/ r^2
=(6.67x10^-11 N*m^2/kg^2)(1010kg) (1010kg)/ (1000m)^2
=6.80x10^-11 N

But the possible answers are:
2.67x 10^4 N
1.33x 10^-6 N
2.67x 10^7 N
2.67x 10^10 N

Can someone tell me what I'm doing wrong? Thanks

  • Physics (answers included) -

    M=m=2.00 × 10^10 kg

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