Gravitational potential energy and kinetic energy — practice question

What is the most suitable estimate for the kinetic energy of a family car moving at $50\,\text{km h}^{-1}$?

• A$1.5 \times 10^3\,\text{J}$
• B$1.5 \times 10^5\,\text{J}$
• C$1.5 \times 10^7\,\text{J}$
• D$1.5 \times 10^9\,\text{J}$