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pav-90 [236]
2 years ago
13

Can sum1 hurry and give me the answers to theses pls !!

Mathematics
1 answer:
suter [353]2 years ago
6 0

Answer:

i dont understand what you want us to do lol?

Step-by-step explanation:

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A stuntman jumping off a 20-m-high building is modeled by the equation h = 20 – 5t2, where t is the time in seconds. A high-speed camera is ready to film him between 15 m and 10 m above the ground. For which interval of time should the camera film him?

Answer:

1\leq t\geq \sqrt{2}

Step-by-step explanation:

Given:

A stuntman jumping off a 20-m-high building is modeled by the equation

h =20-5t^{2}-----------(1)

A high-speed camera is ready to making film between 15 m and 10 m above the ground

when the stuntman is 15m above the ground.

height h = 15m  

Put height value in equation 1

15 =20-5t^{2}

5t^{2} =20-15

5t^{2} =5

t^{2} =1

t =\pm1

We know that the time is always positive, therefore t=1

when the stuntman is 10m above the ground.

height h = 10m  

Put height value in equation 1

10 =20-5t^{2}

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t^{2} =\frac{10}{5}

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Therefore ,time interval of camera film him is 1\leq t\geq \sqrt{2}

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