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17.12.2019 •
Physics
Astone is thrown vertically downwards from the top of a skyscraper with an initial speed of 5.10m/s. the stone hits the street below 7.60 seconds after being thrown.how tall is the skyscraper?
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Ответ:
322 m
Explanation:
y = y₀ + v₀ t + ½ gt²
If we take down to be positive, then:
y = 0 + (5.10) (7.60) + ½ (9.8) (7.60)²
y = 322 m
The skyscraper is 322 m tall.
Ответ:
MGH=energy
3500*9.8*h=90000
h=90000/34300
h=2.62m