The hammer of a pile driver strikes the pile with a speed of 15 m/s, what is the height above the top of the pile did it fall? Please give me the formula

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Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

Ithink it's  c. i'm sure