A lava rock falling for five seconds will reach a height of 122.5 meters.
The missing function is y = 1/2 gt².
<h3>What is a function?</h3>
A function is a remark, tenet, or regulation that establishes a relationship between the two parameters.
The height of lava fountains spewed from volcanoes cannot be measured directly.
Instead, their height in meters can be found using the equation is given as
y = 1/2 gt²
where y represents the height, g is 9.8, and t represents the falling time of the lava rocks.
Then the equation will be
y = 1/2 × 9.8 × t²
y = 4.9t²
Then the height in meters of a lava rock that falls for 5 seconds will be
y = 4.9 x 5²
y = 122.5 meters
More about the function link is given below.
brainly.com/question/5245372
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