If momentum decreases by 20% kinetic energy will decrease _____?
Lecturer Physics Past Papers and Syllabus / All — Multiple-choice practice
- A. None of these
- B. 36%
- C. 8%
- D. 40%
Correct answer
36%
Explanation
Explanation Momentum (p) is proportional to velocity (v), while kinetic energy (KE) is proportional to v². When momentum decreases by 20% , velocity decreases by 20% . So, kinetic energy decreases by (1 - 0.8²) × 100% ≈ 36%.
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