For uniform acceleration in linear motion which of the following is...

For uniform acceleration in linear motion, the acceleration $a$ is constant.

The kinematic equation for velocity is $v = u + at$, which represents a linear relationship between velocity $v$ and time $t$.

Thus, the velocity-time graph is a straight line (linear).

The slope of the velocity-time graph gives the acceleration, and the area under it gives the displacement.

Therefore, the statement 'Velocity-time graph is non-linear' is incorrect.

Answer: Velocity-time graph is non-linear.