State whether the distance–time graphs and the velocity–time graphs will be straight-line with a non-zero gradient or zero gradient or curved in the following cases: (a) the velocity is constant and...

State whether the distance–time graphs and the velocity–time graphs will be straight-line with a non-zero gradient or zero gradient or curved in the following cases: (a) the velocity is constant and not zero, (b) the acceleration is constant and not zero, (c) the distance covered in each second of the motion is the same, (d) the distance covered in each successive second doubles.