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skelet666 [1.2K]
3 years ago
12

If an object is dropped from a height of 116 feet, the function h(t)=-16t^2+116 gives the height after t seconds. When will the

object hit the ground?
Mathematics
2 answers:
PIT_PIT [208]3 years ago
4 0

Answer:

2.69 seconds

Step-by-step explanation:

the function for the height and time is:

h(t)=-16t^2+116

when the object collides with the ground, it means that at that moment its height is zero. So we need to solve the equation above for when h(t) equals zero:

0=-16t^2+116

clearing for t:

-116=-16t^2\\\frac{-116}{-16}=t^2\\ 7.25=t^2\\\sqrt{7.25}=t\\ 2.69=t

the object will hit the ground at time 2.69 seconds

7nadin3 [17]3 years ago
3 0
Let h(t)= 0 (because when it reaches the ground h=0)

0=-16t^2+116
16t^2=116
divide both sides by 16
t^2= 7.25
square root both sides to find t
t=2.69sec
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