Exam-style question
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A car of mass 1500 kg is moving at a speed of 20 m/s. Calculate its kinetic energy.
- A.300,000 J
- B.150,000 J
- C.60,000 J
- D.30,000 J
Model answer
What a good answer should say
- 300,000 J
Explanation
Why this works
The kinetic energy (Ek) is calculated using the formula Ek = 0.5 x m x v^2. Substituting the values: Ek = 0.5 x 1500 kg x (20 m/s)^2 = 0.5 x 1500 x 400 = 300,000 J.
Thus, the kinetic energy of the car is 300,000 J.
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