In the given velocity-time graph, the body is said to have
Correct answer: D. negative acceleration in region III.
- A. zero acceleration in region I.
- B. variable acceleration in region II.
- C. positive acceleration in region III.
- D. negative acceleration in region III.
Explanation
* Acceleration is represented by the slope of a velocity-time graph. * A positive slope indicates positive acceleration. * A negative slope indicates negative acceleration (deceleration). * A zero slope (horizontal line) indicates zero acceleration (constant velocity). * A curved line indicates variable acceleration.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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