Answer:
The formula for kinetic energy (KE) is \( KE = \frac{1}{2} \times \text{mass} \times \text{speed}^2 \).
For car A:
\[ KE_A = \frac{1}{2} \times 200 \, \text{kg} \times (30 \, \text{km/h})^2 \]
Calculate the kinetic energy of car A using this formula.
The kinetic energy of car A is \( KE_A = \frac{1}{2} \times 200 \, \text{kg} \times (30 \, \text{km/h})^2 = 90,000 \, \text{J} \).
