Answer:
seven
Step-by-step explanation:
Lol thxx for the points
Pls give brainliest! Also, plz sub to kgirl633 on yt.
For this case we have the following equation:
![H (t) = -16t ^ 2 + vt + s](https://tex.z-dn.net/?f=%20H%20%28t%29%20%3D%20-16t%20%5E%202%20%2B%20vt%20%2B%20s%20%20)
Where,
t: time
v: initial speed
s: initial height
Substituting values we have:
![H (t) = -16t ^ 2 + 15t + 4](https://tex.z-dn.net/?f=%20H%20%28t%29%20%3D%20-16t%20%5E%202%20%2B%2015t%20%2B%204%20%20)
By the time the ball hits the ground we have:
![-16t ^ 2 + 15t + 4 = 0](https://tex.z-dn.net/?f=%20-16t%20%5E%202%20%2B%2015t%20%2B%204%20%3D%200%20%20)
From here, we clear the value of time:
Using the quadratic equation we have:
![t=\frac{-15+/-\sqrt{15^2-4(-16)(4)}}{2(-16)}](https://tex.z-dn.net/?f=%20t%3D%5Cfrac%7B-15%2B%2F-%5Csqrt%7B15%5E2-4%28-16%29%284%29%7D%7D%7B2%28-16%29%7D%20%20%20)
Doing the calculations we have:
![t1=-0.217\\t2=1.154](https://tex.z-dn.net/?f=%20t1%3D-0.217%5C%5Ct2%3D1.154%20)
Discarding the negative root, we have that the time is:
Answer:
it takes the ball to hit the floor about:
1.15 seconds
-1/2(-4/5)
Multiply the numerators by each other and do the same for the denominators.
That is:
-1(-4)=4
And 2*5=10
Now we have 4/10
Divide the numerator and the denominator by 2 to get 2/5 which is the simplest form.
Hope this helped.
Answer:
your question is not complete or should I say not correct ☺️
Answer:
Look below
Step-by-step explanation: