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carlo123
29.07.2019 •
Mathematics
Aball is thrown upward from a height of 15ft with an initial upward velocity of 5ft/s. use the formula h=-16t2(t is squared)+ vt + s to find how long it will take for the ball to hit the ground .
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Ответ:
The ball has hit the ground in about 1.137 seconds.
Step-by-step explanation:
The ball has hit the ground when the height between the ball and the ground is 0. So we will be setting h equal to 0 and then solving this equation for t.
h=-16t^2+vt+s
v represents the initial velocity
s represents the initial height
v is given as 5ft/s.
s is given as 15ft.
Inputting these in result in:
h=-16t^2+5t+15
Now we are finding for what t's do we have h=0:
0=-16t^2+5t+15
Let's calculate the discriminant to predict how messy are answers are going to be.
Discriminant=b^2-4ac
Discriminant=(5)^2-4(-16)(15)
Discriminant=25+960
Discriminant=985
It isn't a perfect square so we can't factor this.
I'm going to use the quadratic formula:
This implies we have two values for t to look at when h=0:
Inputting both of these into the calculator:
So the answer that makes sense here is the later answer.
The ball has hit the ground in about 1.137 seconds.
Ответ:
-7
Step-by-step explanation:
-3x-5=16
-3x-5+5=16+5
-3x=21
-3x/-3=21/-3
x=-7