kdndiamond9101
10.03.2022 •
Mathematics
Please help with questions 2 and 4
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Ответ:
8.8 seconds
Step-by-step explanation:
Taking g = 9.81 m/s²
Convention: downwards positive
30 = -40t + 0.5(9.81)t²
4.905t² - 40t - 30 = 0
t = 8.846327763, -0.6913838279
t = 8.8s