glowbaby123
28.06.2019 •
Mathematics
The distance d (in feet) a penny falls from the window of a building is represented by d = 16t^2 where t is the time (in seconds) it takes for a penny to hit the ground. how long does it take for the penny to hit the ground when it falls from a height of 400 feet?
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Ответ:
5 seconds
Step-by-step explanation:
d = 16t^2
You are given the distance, d, and you need to find the time, t. Replace d with the given distance, 400 ft.
d = 400
400 = 16t^2
Switch sides.
16t^2 = 400
Divide both sides by 16.
t^2 = 25
Take the square root of both sides.
t = 5
5 seconds
Ответ: