Question

Define of variable velocity

Answer 1

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An object that has uniform velocity is said to be traveling at constant velocity.

An object that is traveling at variable velocity, means that the object's velocity is changing, varying, non-constant, etc. This means the object has an acceleration as the definition of acceleration is rate of change of velocity.
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Answer 2

Answer:

• Variable velocity, velocity in which the space described varies from instant, either increasing or decreasing; -- in the former case called accelerated velocity, in the latter, retarded velocity; the acceleration or retardation itself being also either uniform or variable.