Question

An apple is 4.50 m above the ground when it breaks off the tree branch and begins to fall. How long is it in free fall?

Answer 1

The time elapsed is `0.92s`

Explanation:

Consider the equation of free fall `s=vt+1/2at^2` at `t=0` `v=0`.
So `s=1/2at^2` `t=sqrt(2s/a)=sqrt((2*4.5)/(9.81))=0.92s`