Help meeeeeeeeeeeeeee pleaseeeeeee

asked Sep 3, 2023 2.3k views

4 votes

7.7k points

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4 votes

Answer:

10.8 sec

Explanation:

Setting
h=10 ,

$-16t^2+170t+40=10 \\ \\ 16t^2 -170t-30=0 \\ \\ 8t^2 - 85t-15=0 \\ \\ t=(85 \pm √((-85)^2-4(8)(-15)))/(2(8)) \\ \\ t \approx 10.8 (t>0)$

Nexo answered Sep 7, 2023

by Nexo

8.3k points

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