Which statement is a counterexample to:

"All basketball players are more than 6 feet tall."

Always when we have a statement like:

"all of {some group} have {a given property}"

A counterexample of this is:

"There exists at least one element of the given group that does not meet the property"

Then we have the statement"

All basketball players are most than 6 ft tall

The counterexample would be:

There exist one basketball player that measures 6ft

or

There exist one basketball player that measures less than 6ft

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.