A marble is rolled down a ramp. The distance it travels is described by the formula d = 4902
where d is the distance in centimeters that the marble rolls in t seconds. If the marble is
released at the top of a ramp that is 3,920 cm long, for what time period will the marble be
more than halfway down the ramp?

A) T > 2
B) T > 4
C) T > 8
D) T > 16

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.