The acceleration-time graph of a body is shown below
The most probable velocity-time graph of the body is
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(3) From given graph it is clear that acceleration is increasing at constant rate
∴ (constant) ⇒ (by integration)
i.e. v is dependent on time parabolically and parabola is symmetric about v-axis.
and suddenly acceleration becomes zero. i.e. velocity becomes constant.
Hence (3) is most probable graph.