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The height, [tex]\( h \)[/tex], of a falling object [tex]\( t \)[/tex] seconds after it is dropped from a platform 300 feet above the ground is modeled by the function [tex]\( h(t) = 300 - 16t^2 \)[/tex]. Which expression could be used to determine the average rate at which the object falls during the first 3 seconds of its fall?

A. [tex]\( h(3) - h(0) \)[/tex]

B. [tex]\( h\left(\frac{3}{3}\right) - h\left(\frac{0}{3}\right) \)[/tex]

C. [tex]\( \frac{h(3)}{3} \)[/tex]

D. [tex]\( \frac{h(3) - h(0)}{3} \)[/tex]


Sagot :

To determine the average rate at which the object falls during the first 3 seconds of its fall, we want to calculate the average rate of change of the height function [tex]\( h(t) = 300 - 16t^2 \)[/tex].

The average rate of change of a function [tex]\( h(t) \)[/tex] over an interval [tex]\([t_1, t_2]\)[/tex] is given by:
[tex]\[ \text{Average Rate of Change} = \frac{h(t_2) - h(t_1)}{t_2 - t_1} \][/tex]

In this case, we are looking at the interval from [tex]\( t_1 = 0 \)[/tex] to [tex]\( t_2 = 3 \)[/tex].

1. First, we need to find [tex]\( h(0) \)[/tex].
[tex]\[ h(0) = 300 - 16 \cdot 0^2 = 300 \][/tex]

2. Next, we need to find [tex]\( h(3) \)[/tex].
[tex]\[ h(3) = 300 - 16 \cdot 3^2 = 300 - 16 \cdot 9 = 300 - 144 = 156 \][/tex]

3. Now, we use these values to find the average rate of change over the interval [tex]\( [0, 3] \)[/tex].
[tex]\[ \text{Average Rate of Change} = \frac{h(3) - h(0)}{3 - 0} = \frac{156 - 300}{3} = \frac{-144}{3} = -48 \][/tex]

Therefore, the average rate at which the object falls during the first 3 seconds is:
[tex]\[ \text{Average Rate of Change} = -48 \text{ feet per second} \][/tex]

Out of the given expressions, the correct one that determines the average rate at which the object falls during the first 3 seconds is:
[tex]\[ \frac{h(3) - h(0)}{3} \][/tex]

Thus, the correct choice is:
[tex]\[ \boxed{\frac{h(3) - h(0)}{3}} \][/tex]