a ball is dropped from rest at a height of 80 m above the ground. what is the speed just as it hits the ground?

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12-02-2015
Physics

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a ball is dropped from rest at a height of 80 m above the ground. what is the speed just as it hits the ground?

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dln dln · Answer 1 · 2015-02-12T06:31:14+01:00

dln dln

12-02-2015

Δx=Vi(t)+.5at²
Δx=80
a=9.8
Vi=0 since its from rest, the initial velocity is 0.
80=0+.5(9.8)t²
t=16.33
You can use one of the big five equations: Vf=Vi+at
Vf=0+9.8(16.33)
Vf=160.034 m/s

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