Sheila leaves on a long trip driving at a steady rate of 30 miles per hour. her sister allison leaves from the same location traveling to the same destination 2 hours later. she drives at a steady rate of 45 miles per hour. how long after allison leaves home will she catch up to sheila? a. 6 hours b. 4 hours c. 5 hours d. 2 hours

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.