Question

3.If a stone is dropped from a cliff, what will be its speed after it has fallen 100m?

Consider acceleration= 10m/s2​

Answer 1

Answer:

45.27m/s approx

Explanation:

Given:-

•Distance(s)=100m

•Acceleration due to gravity(g)=9.8m/s²

•Initial velocity(u)=0

To find:-

•Speed of the stone when it has fallen 100m

Solution:-

By using the 3rd equation of motion,when u=0,we get:-

=>v²=2gs

=>v²=2×9.8×100

=>v²=1960

= > v = \sqrt{1960}=>v=

1960

=>v=44.27m/s(approx)

Thus,speed of the stone when it has fallen 100m is 44.27m/s.