Which of the following best describes the velocity-time graph for an object moving with uniform velocity?
A straight horizontal line parallel to the time axis
To solve the given question, we need to understand the characteristics of a velocity-time graph for an object moving with uniform velocity.
Uniform velocity means that the object is moving at a constant speed without changing its direction. In terms of a velocity-time graph, this is represented by:
- A straight horizontal line parallel to the time axis.
This is because the velocity is constant over time, meaning it does not increase or decrease. In contrast, if the line were sloped upwards or downwards, it would indicate acceleration (change in velocity), which contradicts the condition of uniform velocity.
Let's evaluate the options given:
- A curved line above the time axis: A curve would indicate a changing velocity, suggesting acceleration or deceleration. Thus, this is incorrect for uniform velocity.
- A line starting from the origin and sloping upwards: Such a line would indicate a constant rate of acceleration, as velocity increases with time. This option is also incorrect.
- A straight line sloping upwards from the time axis: This would again indicate increasing velocity over time, or acceleration. Hence, this is incorrect for uniform velocity.
- A straight horizontal line parallel to the time axis: This represents a constant velocity, as the velocity value does not change over time. Thus, this is the correct answer.
Based on the above explanations, the correct answer is:
A straight horizontal line parallel to the time axis
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