Final answer:
The velocity-time graph for an object with constant acceleration is a straight line. The velocity-time graph for an object with constant velocity is a horizontal line. The acceleration in region A is greater than the acceleration in region C.
Step-by-step explanation:
(a) When an object undergoes constant acceleration, the velocity-time graph will be a straight line with a positive or negative slope, depending on the direction of the acceleration. The steeper the slope, the greater the magnitude of the acceleration.
(b) For an object with constant velocity, the velocity-time graph will be a horizontal line parallel to the time-axis. This indicates that the velocity of the object remains constant over time.
(c) In region A, the acceleration of the body is positive and non-zero. In region C, the acceleration is zero since the velocity remains constant. Therefore, the acceleration in region A is greater than the acceleration in region C.