Newton's Second Law
A force of 20 N acts on a body of mass 4 kg initially at rest. What will be its velocity after 5 seconds?
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- newton's second law
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
25 m/s
- Newton's Second Law: F=ma.
- Find Acceleration (a):
- a=F/m=20 N/4 kg=5 m/s2.
- Kinematic Equation: Use v=u+at.
- Substitution:
- Initial velocity u=0 (at rest).
- Acceleration a=5 m/s2.
- Time t=5 s.
- Calculation: v=0+(5×5)=25 m/s.
This easy difficulty physics question is from the chapter laws of motion, covering the topic of newton's second law. It appeared in the 2025 exam.
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