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Motion — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceMotion1 Mark
Question
The velocity of a body can change:
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Answer

  1. If its acceleration is non-zero.
Explanation:
Acceleration is defined as change of velocity in unit time.
So if acceleration is zero, there is no change of velocity, the body is moving with a constant velocity.

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