Exam-style question
Try this first
If a 10 kg object falls from a height of 20 m, what is its gravitational potential energy just before it hits the ground? Use g = 9.8 N/kg.
- A.1960 J
- B.980 J
- C.2000 J
- D.1000 J
Model answer
What a good answer should say
- 1960 J.
- the correct option
Explanation
Why this works
The correct answer is 1960 J. This supports Use kinetic energy and gravitational potential energy equations.
in Work, energy and power 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.