How can you tell if a fraction is a unit fraction?

if it has 1 on the top when simplified

For example, 1/3 is a unit fraction, and 2/6 is also an unit fraction, because it simplifies to 1/3.

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.