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Jen served the final point before winning her tennis match! She tossed the ball up into the air from a height of 5 feet with a velocity of 22 feet per second. After the ball started to come back down, Jen hit the ball with her racket at a height of 6 feet.Which equation can you use to find how many seconds the ball was in the air before Jen hit it?If an object travels upward at a velocity of v feet per second from s feet above the ground, the object's height in feet, h, after t seconds can be modeled by the formula h=–16t2+vt+s.6=–16t2+22t+55=–16t2+22t+6To the nearest tenth of a second, how long was the ball in the air before Jen hit it? seconds

Question

Jen served the final point before winning her tennis match! She tossed the ball up into the air from a height of 5 feet with a velocity of 22 feet per second. After the ball started to come back down, Jen hit the ball with her racket at a height of 6 feet.Which equation can you use to find how many seconds the ball was in the air before Jen hit it?If an object travels upward at a velocity of v feet per second from s feet above the ground, the object's height in feet, h, after t seconds can be modeled by the formula h=–16t2+vt+s.6=–16t2+22t+55=–16t2+22t+6To the nearest tenth of a second, how long was the ball in the air before Jen hit it? seconds

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Solution 1

To find out how long the ball was in the air before Jen hit it, we need to solve the equation for t (time). The equation given is:

6 = -16t^2 + 22t + 5

First, we need to rearrange the equation to look like a standard quadratic equation (ax^2 + bx + c = 0). We do this by subtracting 6 from both sides:

-16t^2 + 22t - 1 = 0

Now we can use the quadratic formula to solve for t. The quadratic formula is:

t = [-b ± sqrt(b^2 - 4ac)] / (2a)

In our equation, a = -16, b = 22, and c = -1. Plugging these values into the quadratic formula gives us:

t = [-22 ± sqrt((22)^2 - 4*(-16)(-1))] / (2(-16)) t = [-22 ± sqrt(484 - 64)] / -32 t = [-22 ± sqrt(420)] / -32

We get two solutions for t, one when we use the plus sign in the formula and one when we use the minus sign. However, since time cannot be negative, we discard the solution that gives us a negative value for t.

After calculating the above expression, we find that t is approximately 0.7 seconds. So, the ball was in the air for about 0.7 seconds before Jen hit it.

This problem has been solved

Solution 2

To find out how long the ball was in the air before Jen hit it, we need to solve the equation for t (time). The equation given is:

6 = -16t^2 + 22t + 5

First, we need to rearrange the equation to set it equal to zero:

0 = -16t^2 + 22t - 1

This is a quadratic equation in the form of at^2 + bt + c = 0, where a = -16, b = 22, and c = -1. We can solve for t using the quadratic formula, which is:

t = [-b ± sqrt(b^2 - 4ac)] / (2a)

Substituting the values of a, b, and c into the formula, we get:

t = [-22 ± sqrt((22)^2 - 4*(-16)(-1))] / (2(-16))

Solving the equation will give us two possible values for t. However, since time cannot be negative, we discard the negative value. The positive value will give us the time in seconds that the ball was in the air before Jen hit it.

Please note that you will need a calculator to solve the equation.

This problem has been solved

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