Question

plot momentum (along y axis) and velocity (along x axis) graph ...

Answer 1

We need more information.

Answer 2

Does the mass of this object change? If not, you're just gonna get a 0th order function, aka a constant (horizontal line).

Answer 3

if there is velocity increasing & mass remains constant then, m x v = momentum will increase faster than velocity as
A curved graph tending to momentum:)