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26 July, 08:19

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?

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  1. 26 July, 08:26
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    Your answer: 1 ≤ t ≤ √2
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