State the reason why velocity-time graph can never be a straight line parallel to velocity-axis?

A velocity time graph can never be a straight line parallel to velocity axis because velocity always changes within a certain period of time and at one time it is impossible. For example, if a vehicle changes its velocity from 0m/s to 75m/s then it must have changed it within a period of time not at one time.

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Velocity Time graph can never be a straight line parallel to velocity axis because if it is aline parallel to velocity axis then it means the velcity is changing without a change in time as we know velocity can never change without a change in time therefore it is not possible for a graph to have a line parallel to the velocity axis
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as that means infinite velocity.

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