Retardation
Easyphysics
A car moving at 72 km/h is brought to rest in 5 seconds by applying brakes. What is the retardation?
Select the correct option:
Solution
Incorrect! Answer:
4 m/s²
- Unit Conversion: u=72 km/h =72×(5/18)=20 m/s.
- Given Data: v=0, t=5 s.
- Use Acceleration Formula: a=tv−u=50−20=−4 m/s2.
- Concept: Retardation is the magnitude of the deceleration.
- Result: Retardation is 4 m/s2.
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About This Question
- Subject
- physics
- Chapter
- kinematics
- Topic
- retardation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
4 m/s²
- Unit Conversion: u=72 km/h =72×(5/18)=20 m/s.
- Given Data: v=0, t=5 s.
- Use Acceleration Formula: a=tv−u=50−20=−4 m/s2.
- Concept: Retardation is the magnitude of the deceleration.
- Result: Retardation is 4 m/s2.
This easy difficulty physics question is from the chapter kinematics, covering the topic of retardation. It appeared in the 2025 exam.
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