Work-energy Theorem
Net work on a 4 kg body is 80 J from rest. Final speed?
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About This Question
- Subject
- physics
- Chapter
- work, energy and power
- Topic
- work-energy theorem
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
6.32 m/s
- Work-Energy Theorem: The net work done on an object is equal to its change in kinetic energy (Wnet=ΔK).
- Constraint: Since it starts from rest, Kinitial=0.
- Formula: Wnet=21mv2.
- Solve for v:
- v2=m2W
- v=42×80=4160=40.
- Calculation: 40≈6.3245 m/s.
- Result: Final speed is 6.32 m/s.
This medium difficulty physics question is from the chapter work, energy and power, covering the topic of work-energy theorem. It appeared in the 2025 exam.
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