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

final velocity will be44.72m/s

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

44.2m/s

Explanation:

2gs = vf*2 - vi*2

2 x 9.8 x 100 = vf*2 - 0

1960 = vf*2

vf = 44.2 m/s

3. dark matter

empty space could also be a simple vacuum

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.