Exam-style question
Try this first
A car of mass 800 kg is moving with a speed of 20 m/s. What is its kinetic energy?.
- A.160,000 J
- B.80,000 J
- C.320,000 J
- D.400,000 J
Model answer
What a good answer should say
- 160,000 J.
- the correct option
Explanation
Why this works
The correct answer is 160,000 J. This supports State and apply conservation of energy.
in Conservation of energy because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
No common mistake is linked to this question yet.