Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
2 m/s²
B
4 m/s²
C
5 m/s²
D
10 m/s²
Understanding the Answer
Let's break down why this is correct
Answer
The car starts from rest, so its initial speed is 0 m/s, and after 5 seconds its speed is 20 m/s. The change in speed (Δv) is 20 m/s minus 0 m/s, which equals 20 m/s. Because the acceleration is uniform, acceleration (a) is the change in speed divided by the time taken: a = Δv / Δt. Plugging in the numbers gives a = 20 m/s ÷ 5 s = 4 m/s². Thus the car’s constant acceleration is 4 meters per second squared.
Detailed Explanation
Acceleration is the change in speed divided by the time it takes. Other options are incorrect because This answer uses half the correct change; This answer adds the numbers 5 and 20 instead of dividing.
Key Concepts
Acceleration
Dynamics
Topic
Classical Mechanics Principles
Difficulty
medium level question
Cognitive Level
understand
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