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choatefarmsus
01.06.2020 •
Mathematics
Henry is diving off a diving board that is 7 above the water. After 2 seconds, he reaches his maximum
height of 9 above the water. What height will Henry be after 5 seconds?
(please post the solution as well)
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Ответ:
44 m
Step-by-step explanation:
I'll assume the 5 seconds is from the time he jumped off the board.
This means we are to calculate his height 3 seconds after dropping from the height of 9 m, since he spent 2 seconds springing up off the board from a height of 7 m to the 9 m height.
we use Newton's equation of motion.
We are given
initial velocity U at the height of 9 m = 0 m/s
acceleration due to gravity downwards g = 9.81![m/s^{2}](/tpl/images/0673/4144/7d0a1.png)
distance covered S = ?
time of fall t = 3 seconds
we use S = Ut +
g![t^{2}](/tpl/images/0673/4144/7de90.png)
S = (0 x 3) +
(9.81 x
)
S = 0 + 44.145
S = 44 m
Ответ:
https://www.algebra.com/algebra/homework/Angles/Angles.faq.question.1084564.html