What would be acceleration of a body if its velocity-time graph is parallel to the time axis?

Dear student,

When the velocity time graph is parallel to the time axis, this means that the body is moving with a constant velocity.
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$$\begin{gathered} Since, Acceleration = \frac{Change in velocity}{time} \\ As the velocity is cons\tan t, change in velocity=0 \\ so acceleration =0 \end{gathered}$$

Regards