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A stone is dropped from a cliff. What will be its speed when it was fallen 100 m?
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1 vote
A stone is dropped from a cliff. What will be its speed when it was fallen 100 m?

User NCC
by
4.7k points

2 Answers

7 votes

Answer:

44.2m/s

Step-by-step explanation:

2gs = vf*2 - vi*2

2 x 9.8 x 100 = vf*2 - 0

1960 = vf*2

vf = 44.2 m/s

User TomJohn
by
5.7k points
4 votes

Answer:

final velocity will be44.72m/s

Step-by-step explanation:

HEIGHT=h=100m

vi=0m/s

vf=?

g=10m/s²

by using third equation of motion for bodies under gravity

2gh=(vf)²-(vi)²

evaluating the formula

2(10m/s²)(100m)=vf²-(0m/s)²

2000m²/s²=vf²

√2000m²/s²=√vf²

44.72m/s=vf

User Igor Krupitsky
by
4.4k points
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