A ball is dropped from the top of a building which is 39.2m above the level of the sidewalk.

Question

A ball is dropped from the top of a building which is 39.2m above the level of the sidewalk. 
How long does it take for the ball to reach the sidewalk?

bobpursley · Answer

hf=hi+vi*t-4.9t^2 0=39.2+0-4.9t^2 solve for time t.