Answer:
19.8m/s or 14√2 m/s
Explanation:
To find how fast something is going when it strikes the roof, we can use the equation √(2*g*height) where g=9.8 m/s^2 and the height is 20 meters as 25-5=20.
Substituting in we get:
[tex]\sqrt{2*9.8m/s^2*20}[/tex]
[tex]\sqrt{40*9.8m/s^2}[/tex]
[tex]\sqrt{392m/s^2}[/tex]
[tex]14\sqrt{2} m/s[/tex]
or[tex]19.8 m/s[/tex]
