What is the kinetic energy of a 1200 kg car traveling at a velocity of 20 m/s?

Answer and explanation

Correct answer: D. 240,000 J

  1. Step 1: Use kinetic energy formula: KE = 0.5 m v^2.
  2. Step 2: Compute speed squared: v^2 = (20)^2 = 400 m^2/s^2.
  3. Step 3: Multiply by half mass: 0.5 * 1200 kg = 600 kg.
  4. Step 4: Compute product: 600 * 400 = 240,000 J (240 kJ).
Answer
240,000 J.
Why not the others: '120,000 J' forgets to square velocity (computes 0.5 m v); '24,000 J' calculates m * v alone; '480,000 J' forgets the 0.5 factor.

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