Question

A distance of 1 meter separates two negative electric charges of 1-coulomb each.
With what force (in Newtons) do they repel each other. The coulomb constant is
9x10^9 Nm^2/C^2

would this be 1 N???
No, the answer is not 1 N. Look up and apply Coulomb's law.

Force = k Q1 Q2/R^2

The k is the Coulombs constant. The rest of the terms in the equaation are 1 in SI units in your case. This results in a very large value for the force, in Newtons

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