A medium-sized family car is travelling along a road at a speed of 20 m s-1.
What is a reasonable estimate for the kinetic energy of the car?
3×104 J3 \times 10^4\text{ J}3×104 J
3×105 J3 \times 10^5\text{ J}3×105 J
3×106 J3 \times 10^6\text{ J}3×106 J
3×107 J3 \times 10^7\text{ J}3×107 J
