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soldier1979 [14.2K]

3 years ago

8

A ball is thrown into the air with an upward velocity of 32 ft/s. Its height h in feet after t seconds is given by the function

h = –16t2 + 32t + 6. a. In how many seconds does the ball reach its maximum height? Round to the nearest hundredth if necessary. b. What is the ball’s maximum height?
A. 1 s; 22 ft

B. 2 s; 22 ft

C. 1 s; 54 ft

D. 2 s; 6 ft

2 answers:

Ludmilka [50]3 years ago

8 0

The max is -b/2a so find -b/2a then sub into the equation it looks like it is a

Talja [164]3 years ago

3 0

Answer:

A. 1 second ; 22 ft

Step-by-step explanation:

We have been given that a ball is thrown into the air with an upward velocity of 32 ft/s. Its height h in feet after t seconds is given by the function $h=-16t^2+32t+6$ .

a. To find the time it will take the ball to reach its maximum height, we need to find x-coordinate of vertex of our given parabola.

We will use $\frac{-b}{2a}$ to find the x-coordinate of vertex of our given parabola.

$\frac{-32}{2\times -16}$

$\frac{-2}{-2}=1$

Therefore, the ball will reach its maximum after 1 second.

b. To find the ball's maximum height we need to evaluate our given equation at $t=1$ .

$h=-16(1)^2+32(1)+6$

$h=-16*1+32+6$

$h=-16+32+6$

$h=22$

Therefore, the maximum height of ball is 22 ft.

Upon looking at our given choices we can see that option A is the correct choice.

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3 years ago

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Answer:

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Step-by-step explanation:

Please find the attachment.

We have been given that a man flies a kite at a height of 16 ft. The wind is carrying the kite horizontally from the man at a rate of 5 ft./s. We are asked to find how fast must he let out the string when the kite is flying on 34 ft. of string.

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Now, we will use Pythagorean theorem to relate x and y because we know that the vertical side (16) is always constant.

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