GKFix MCQ Question

In the equation mv²r = e²/(4πε₀), if m, r, and ε₀ are known, how can the velocity v be calculated?

• A. v = √[e²/(4πε₀mr)]
• B. v = e²/(4πε₀mr)
• C. v = e/(4πε₀mr)
• D. v = √[e/(4πε₀mr)]