Free fall

How long does the stone fall freely into a depth of 80m? What speed will it hit the bottom of the abyss?

Correct result:

t =  4 s
v =  40 m/s

Solution:

s=12gt2 g=10 m/s2 s=80 m t=2⋅ sg=2⋅ 8010=4 s
v=g⋅ t=10⋅ 4=40 m/s

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