It's cold outside, the water vaper in your breath condenses into tiny droplets of liquid water and ice that you can see.
Answer:
Explanation:
Given
height of grand canyon is 
Rock is dropped i.e. initial velocity is zero

Using Equation of motion

h=height
u=initial velocity
a=acceleration
t=time
here a=acceleration due to gravity


What is the longest the bolt can be and still be acceptable