Question

A stuntman jumping off a 20-m-High building is modeled by the equation h=20-5t^2, where t is the same in seconds. A high-speed camera is ready to film him between 15m and 10m above the ground. For which interval of time should the camera film him?

Answer 1

B on edge 2021 ;))

Explanation:

Answer 2

Answer:
`1\leq t\leq √(2)`

Explanation:

1. You know that the high-speed camera is ready to film him between 15 meters and 10 meters above the ground.

2. The problem gives you the following equation:

`h=20-5t^(2)`

3. Therefore, you must calculate the time when
`h=15` and when
`h=10`, as following:

`h=15\\15=20-5t^(2)\\5t^(2)=5\\t=√(1)\\t=1`

`h=10\\10=20-5t^(2)\\5t^(2)=10\\t=√(2)`

4. Therefore, the answer is:

`1\leq t\leq √(2)`