Answer:
C. quadratic
Step-by-step explanation:
You can rightly guess that ballistic motion is described by a <em>quadratic</em> function.
Differences of the y-values are 5.75, 3.25, 0.75, -1.75, -4.25.
First differences are not constant, but form a linear sequence that decreases by 2.5 between each pair. Since second differences are constant, the function is described by a 2nd-degree polynomial function, a <em>quadratic</em>.
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<em>Comment on other function types</em>
Linear functions have constant first differences. Exponential functions have exponentially increasing first differences. Logarithmic functions have first differences that increase by smaller and smaller amounts.
