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see explanation

Step-by-step explanation:

Given

f(x) = 60 ×

x = 1 → f(1) = 60 × 16 = 960 ← bacteria present after 1 day

x = 2 → f(2) = 60 × 16² = 15360 ← bacteria present after 2 days

x = 3 → f(3) = 60 × 16³ = 245760 ← bacteria present after 3 days

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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