If school starts at 9: 00 and you want to go to walmart, when would be an appropriate time to leave? school is about 10-15 minutes away from the house. walmart about the same, but all including the time walking around in walmart would probably be a half an hour.

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

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.