Energy, work and power — practice question

A woman with a mass of $50\,\text{kg}$ possesses $81\,\text{J}$ of kinetic energy. What speed is she moving at?

• A$1.3\,\text{m s}^{-1}$
• B$1.6\,\text{m s}^{-1}$
• C$1.8\,\text{m s}^{-1}$
• D$3.2\,\text{m s}^{-1}$