Question detail
If an object has a mass of 5 kg and is moving at 3 m s⁻¹, what is its kinetic energy in joules?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
- A. 45
- B. 90
- C. 15
- D. 30
Answer
45
Explanation
Ek = 0.5 m v² = 0.5×5×3² = 45 J.
Common mistake
Confusing Units of Measurement
Students often confuse kinetic energy measured in joules with mass measured in kilograms and speed measured in metres per second.
Always remember that kinetic energy is expressed in joules (J), mass in kilograms (kg), and speed in metres per second (m/s). Keep the units distinct and practice converting between them if necessary.
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