In which of the following scenarios would an observational study be used instead of a survey or experiment ? a) a study to quantify the effect of humidity levels on plant growth b) a study to determine how age effects political preference ) to measure the level of support for a referendum d) a study to observe the effects of a medicine designed to lower cholesterol

a) a study to quantify the effect of humidity levels on plant growth

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.

(x, y)→(x − 8, y − 7)

step-by-step explanation:

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