Answer:
Constant acceleration- A
Constant velocity- C
No velocity or acceleration- B
Step-by-step explanation:
For body moving with a constant acceleration, the rate of change of displacement changes over time. This is proven by the increasing gradient of the curve (A) against time.
A body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient C.
A stationary body covers no displacement as time elapses. thus the flat line with zero gradient.