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Whenever an object moves with a constant speed, its distance - time graph is a

1. Parabola
2. Straight line, perpendicular to the time axis
3. straight line, parallel to the time axis
4. Straight line passing through origin

Correct answer: Straight line passing through origin

Solution

If an object moves with constant speed, distance is directly proportional to time. That gives a straight-line distance-time graph, and if the motion starts from the origin, the line passes through the origin.

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