QuestionB 100 149 8 Height (feet) 120 100 40 20 After 4.5 seconds, what was the object's height? O A. 80 feet ○ B. 90 feet ○ C. 110 feet O D. 120 feet Height of Object arter Launch 7 2 Time (seconds)
Studdy Solution
STEP 1
What is this asking? At 4.5 seconds after launch, how high up was this thing? Watch out! Don't get tricked by the peak height – we're looking at a later point in time!
STEP 2
1. Find the height at 1.5 seconds.
2. Use symmetry to find the height at 4.5 seconds.
STEP 3
Let's look at our graph!
At seconds, the object looks to be at about feet.
STEP 4
Parabolas are symmetrical!
Notice how the highest point is at seconds.
This means the height at seconds (which is seconds *before* the peak) will be the same as the height at seconds (which is seconds *after* the peak).
STEP 5
Since the height at seconds is feet, the height at seconds is also feet due to the symmetry.
Boom!
STEP 6
The object's height after seconds is feet.
So the answer is B!
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