how long would it take a ball to fall 81 feet

Question

How long will it take a ball to fall 81 feet

Answer 1

Assuming the ball was simply dropped (initial velocity of 0) then the distance travelled will simply be 

 

(1/2)*g*t^2 where g = acceleration due to gravity.

 

since we are dealing with feet, we will consider g to be ~32.2 ft/s^2 (source:https://en.wikipedia.org/wiki/Standard_gravity)

 

plugging the values in gives 

81 = 1/2*32.2 * t^2

=> t^2 = 81/16.1 = 5.03

=> t ~2.24s