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A basketball is thrown with an initial upward velocity of 23 feet per second from a height of 7 feet above the ground. The equation [tex]h = -16t^2 + 23t + 7[/tex] models the height in feet [tex]t[/tex] seconds after the basketball is thrown. After the ball passes its maximum height, it comes down and goes into the hoop at a height of 10 feet above the ground.

About how long after it was thrown does it go into the hoop?

A. 1.29 seconds
B. 1.44 seconds
C. 1.70 seconds
D. 0.15 seconds

Answer :

To find out how long it takes for the basketball to go into the hoop at a height of 10 feet above the ground, we need to use the given equation for the height of the ball:

[tex]\[ h = -16t^2 + 23t + 7 \][/tex]

The ball needs to reach a height of 10 feet, so we set [tex]\( h \)[/tex] to 10 and solve for [tex]\( t \)[/tex]:

[tex]\[ 10 = -16t^2 + 23t + 7 \][/tex]

Rearrange the equation to form a standard quadratic equation:

[tex]\[ 0 = -16t^2 + 23t + 7 - 10 \][/tex]

[tex]\[ 0 = -16t^2 + 23t - 3 \][/tex]

Now, let's solve this quadratic equation using the quadratic formula which is:

[tex]\[ t = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \][/tex]

In this equation, the coefficients are:
- [tex]\( a = -16 \)[/tex]
- [tex]\( b = 23 \)[/tex]
- [tex]\( c = -3 \)[/tex]

First, calculate the discriminant ([tex]\( b^2 - 4ac \)[/tex]):

[tex]\[ b^2 = 23^2 = 529 \][/tex]
[tex]\[ 4ac = 4 \times (-16) \times (-3) = 192 \][/tex]
[tex]\[ b^2 - 4ac = 529 - 192 = 337 \][/tex]

Since the discriminant is positive, the quadratic equation has two real solutions. Now we calculate the two possible values for [tex]\( t \)[/tex] (time):

[tex]\[ t = \frac{-23 \pm \sqrt{337}}{2 \times -16} \][/tex]

Calculate the two roots:

1. [tex]\( t_1 = \frac{-23 + \sqrt{337}}{-32} \approx 1.29 \)[/tex] seconds
2. [tex]\( t_2 = \frac{-23 - \sqrt{337}}{-32} \approx 0.15 \)[/tex] seconds

Since time cannot be negative and we're interested in the time after the ball is thrown and passes its maximum height, we choose the positive value that makes sense in this context:

The ball goes into the hoop about [tex]\( 1.29 \)[/tex] seconds after it was thrown.

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Rewritten by : Jeany