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Aliun [14]
3 years ago
7

An object is launched straight up into the air with an initial velocity of 40 meters per second, from a height 30 m above the gr

ound. How many seconds later will the object hit the ground?
Enter your answer as a number rounded to the nearest tenth, such as: 42.5
Mathematics
1 answer:
Alenkinab [10]3 years ago
5 0

Answer:

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

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