What types of motions are represented by the following velocity-time graphs?

(a) Since the velocity-time graph is a straight line, the body has uniform velocity.

(b) The body has uniform acceleration and its initial velocity is zero because the lne starts from the origin.

(c) The body has some initial velocity and is under uniform retardation.

(d) The body has some initial velocity and uniform acceleration.

(e) The body has zero initial velocity and it has variable acceleration.

(f) The body is at rest from O to A, it has uniform acceleration from A to B, it has uniform velocity from B to C and from C to D, the body is under uniform retardation.