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lalimares1038
29.05.2020 •
Mathematics
A ball is thrown downward from the top of a 120-foot building with an initial velocity of 14 feet per second. The hoight of the ball h after t
seconds is given by the equation h= - 16 - 14 +120
How long after the ball is thrown will it strike the ground?
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Ответ:
Correct question:
A ball is thrown downward from the top of a 120-foot building with an initial velocity of 14 feet per second. The hoight of the ball h after t seconds is given by the equation
h= -16t² -14t +120
How long after the ball is thrown will it strike the ground?
2.34 seconds
Step-by-step explanation:
Given:
Height of building = 120 ft
Initial velocity, u = 14 ft/sec
h = -16t² -14t +120
h(t) = -16t² -14t +120
Let's find t when h(t) = 0
Let's factorize the equation,
-2(8t² + 7t - 60) = 0
We now have a quadartic equation:
8t² + 7 - 60 = 0
This equation cannot be factorized easily, so let's take the quadartic formula:
where a=8, b=7, c=-60
Substituting figures, we have:
Since we can't have a negitive sign, let's take the "+" sign
t = 2.34
The ball will hit the ground at 2.34 seconds
Ответ:
See attached
Step-by-step explanation:
Attached graphs for 1, 3, 4, 8 and 9
Intersections marked on the graph, feel free to chose any additional point