How long will a stone fall from a height of 80 m and what speed will it acquire at the end of the fall?
| November 23, 2020 | education
Free fall acceleration will be 10 m / s ^ 2
h = Vоt + g * t ^ 2/2
Vo = 0, therefore h = g * t ^ 2/2
We express t:
t = √ (2 * h / g) = √ (2 * 80/10) = √16 = 4 s
V = Vo + g * t
Vo = 0, therefore V = g * t
V = 10 * 4 = 40 m / s ^ 2
Answer: t = 4c, V = 40 m / s ^ 2
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