# What is the force, in terms of Coulomb's constant, between two electrical charges of -15 C and 60 C that are 15 m  apart?

I found a force of $4$ times $k$.
$F = k \frac{| {q}_{1} {q}_{2} |}{{r}^{2}}$
$F = k \frac{15 \cdot 60}{{15}^{2}} = \frac{60}{15} \cdot k = 4 k$