Exam-style question
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If a car has a mass of 1000 kg and is moving at a speed of 20 m/s, what is its kinetic energy?.
- A.200,000 J
- B.100,000 J
- C.50,000 J
- D.400,000 J
Model answer
What a good answer should say
- 200,000 J
Explanation
Why this works
Kinetic energy is calculated using the formula: Ek = 0.5 x m x v^2. Substituting the values: Ek = 0.5 x 1000 kg x (20 m/s)^2 = 200,000 J.
This represents the energy due to the car's motion.
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