Which of these variables would MOST likely be examined through observational studies? A. None of variables

B. The speed at which a test object is released

C. The economic output of a country

D. The amount of current through in an electric device

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.

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step-by-step explanation:

-81 -56 -27 0 81

step-by-step explanation: